STATISTIC PROBABILITY 2112 WEEK 11 20 BY JAYSON PANALANDANG.docx

```BL-STAT-2112-LEC-1922S STATISTICS
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Week 19: Linear Relationships
Long Quiz 4
Started on
State
Completed on
Time taken
Saturday, 8 February 2020, 4:18 PM
Finished
Saturday, 8 February 2020, 4:23 PM
4 mins 41 secs
17.00 out of 20.00 (85%)
Question 1
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Question text
Describe the relationship based when r value = 0.63
Select one:
a. Minimal positive correction
b. Weak positive correction
c. No apparent correlation
d. Strong positive correction
Question 2
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Given the equation 9y = 2x + 81, what is the y intercept?
9
Question 3
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Bivariate is defined as the analysis of a single variable.
Select one:
a. FALSE
b. TRUE
Question 4
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A businessman is increasing his price for processed food, claiming that the cost
of labor and material is going up and accounts for 75% of his budget. In a
random sample of 10 of the processed food, it is found out that in 6 of the
processed food, the cost of the material is higher.
What is the standard error of the proportion?
Select one:
a. 0.442
b. 0.137
c. 0.391
d. 0.296
Question 5
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Given the equation y = 7x+ 30, what is the slope?
4.2
Question 6
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Given the data below, what is the direction of the association between the two
variables.
Select one:
a. None of the choices
b. Positive linear association
c. Negative linear association
d. Weak linear association
e. Strong linear association
Question 7
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Write the slope-intercept equation of the line that has slope 6 and y-intercept 4.
Select one:
a. 6x
b. y
c. 4x
d. 6x+4
e. 4y
f. 4x+6
g. 6y
h. y
Question 8
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The equation y=mx + b is also known as
Select one:
a. correlation intercept form
b. xy intercept form
c. slope intercept form
d. y intercept
Question 9
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The graph below describes a ______________________ correlation.
Select one:
a. Inverse Correlation
b. Perfect Positive Correlation
c. Perfect Negative Correlation
d. Downline Correlation
Feedback
Question 10
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Question text
Linear correlation coefficient is always a value between ____ and ____.
Select one:
a. 1, 100
b. 0, 100
c. +1, -1
d. 0, 1
Question 11
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Given the following data, compute for the correlation coefficient. Round your
answer into 2 decimal places. If the answer is a whole number, do not put a
decimal after it.
1 to 1.
Question 12
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If the line has no slope,
Select one:
a. The line lies at the x axis
b. The line intercepts the x and y axis
c. The line is a horizontal line
d. The line is at the point of origin
Question 13
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The equation y=mx + b is also known as
Select one:
a. y intercept
b. correlation intercept form
c. xy intercept form
d. slope intercept form
Question 14
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The traffic management office claims that 65% of road accidents are related to
motorcycles. In a random sample of 200 accidents, it is found that 135 of the
accidents are related to motorcycles.
What is the standard error of the proportion?
Select one:
a. 0.077
b. 0.034
c. 0.045
d. 0.062
Question 15
Correct
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Question text
A building contractor/engineer is increasing his price for building projects,
claiming that the cost of labor and material is going up and accounts for 65% of
his budget. In a random sample of 30 of his projects it is found that in 20 of the
projects the cost of the material is higher. At the 5% level of significance, test
the contractor/engineer’s claim. Based on the test, what can you conclude?
Select one:
a. Accept the null hypothesis
b. Reject the null hypothesis
Question 16
Correct
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Question text
Which of the following is INCORRECT about correlation coefficient.
Select one:
a. correlation coefficient can be negative or positive
b. correlation coefficient is the number that quantifies two aspects of
relationship between the data
c. correlation coefficient can never be a zero value
d. when correlation coefficient is equal to 1, then the data is perfectly linear
Question
Correct
17
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When examining scatterplot and draw an ellipse around the data, long and
narrow ellipses means
Select one:
a. Cannot determine with the given information
b. Weak linear association
c. Strong linear association
d. Positive linear association
e. Negative linear association
Question 18
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The variable that causes an effect
Select one:
a. Explanatory variable
b. Response variable
c. Trend variable
d. Correlation variable
Question 19
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Describe the relationship based when r value = 0.01
Select one:
a. Weak positive correction
b. Minimal positive correction
c. Strong positive correction
d. No apparent correlation
Question 20
Correct
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The value of a perfect positive coefficient is ________.
Select one:
a. None of the choices
b. A positive number greater than 0.
c. Equal to 1.
d. Equal to zero.
e. A positive number greater than 1
BL-STAT-2112-LEC-1922S STATISTICS
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Week 17: Displaying Bivariate Data
Learning Activity 4
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Time taken
Saturday, 8 February 2020, 4:16 PM
Finished
Saturday, 8 February 2020, 4:18 PM
1 min 39 secs
8.00 out of 10.00 (80%)
Question 1
Correct
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A Police Sub Station claims that 45% of crimes are related to cell phone
snatching. In a random sample of 150 accidents, it is found that 60 of the
accidents are related to cell phone snatching.
What is the test statistic for this scenario?
Select one:
a. -1.231
b. -0.066
c. 2.112
d. 1.992
Question 2
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About 30% of the male population living in an urban area smokes cigarette. A
researcher believes that male aged 16-30 are more likely smokes cigarette than
other ages in the urban area population. The researcher surveys 300 male aged
16-30 and finds that 80 of them smokes cigarette: What is the standard error of
the proportion?
Select one:
a. 0.026
b. 0.089
c. 0.041
d. 0.011
Question 3
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Given the data, what is the strength of the association between the two
variables.
Select one:
a. None of the choices
b. Positive linear association
c. Strong linear association
d. Weak linear association
e. Negative linear association
f. All of the choices
Question 4
Correct
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Question text
The traffic management office claims that 65% of road accidents are related to
motorcycles. In a random sample of 200 accidents, it is found that 135 of the
accidents are related to motorcycles.
What is the test statistic for this scenario?
Select one:
a. 0.0808
b. 0.0548
c. 0.0741
d. 0.0993
Question 5
Correct
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The goal of examining bivariate data is to show some relativity or association
between two or more variables.
Select one:
a. The statement is TRUE.
b. The statement is FALSE.
Question 6
Correct
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In a ____________, high values in one variable correspond to high values in the
other variable.
Select one:
a. Perfect Correlation
b. Positive Correlation
c. Scattered Correlation
d. Negative Correlation
Question 7
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This measures relationship between bivariate data.
Select one:
a. Linear Regression
b. None of the choices
c. Correlation
d. All of the choices
e. Scatterplot Analysis
Question 8
Correct
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Question text
The traffic management office claims that 65% of road accidents are related to
motorcycles. In a random sample of 200 accidents, it is found that 135 of the
accidents are related to motorcycles.
What is the observed value of the sample proportion?
Select one:
a. 0.822
b. 0.675
c. 0.963
d. 0.367
Question 9
Correct
Mark 1.00 out of 1.00
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Question text
A building contractor/engineer is increasing his price for building projects,
claiming that the cost of labor and material is going up and accounts for 65% of
his budget. In a random sample of 30 of his projects it is found that in 20 of the
projects the cost of the material is higher. At the 5% level of significance, test
the contractor/engineer’s claim. Based on the test, what can you conclude?
Select one:
a. Accept the null hypothesis
b. Reject the null hypothesis
Question 10
Incorrect
Mark 0.00 out of 1.00
Flag question
Question text
A Police Sub Station claims that 45% of crimes are related to cell phone
snatching. In a random sample of 150 accidents, it is found that 60 of the
accidents are related to cell phone snatching.
What is the standard error of the proportion?
Select one:
a. 0.041
b. 0.066
c. 0.033
d. 0.028
BL-STAT-2112-LEC-1922S STATISTICS
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Week 15: p-Values
Long Quiz 3
Started on
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Completed on
Time taken
Saturday, 8 February 2020, 4:11 PM
Finished
Saturday, 8 February 2020, 4:15 PM
4 mins 11 secs
16.00 out of 20.00 (80%)
Question 1
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Suppose that the z is the test statistics for hypothesis testing, calculate the
value of the z for each of the following. Express your answer in 2 decimal places.
&micro; = 77, σ = 6, n = 109, x̄ = 78.2
Question
2
12.83
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Find the sample size given 99% confidence, Margin of Error = 0.11 and ̂p = 0.35.
126
Question 3
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Margin of error is
Select one:
a. the quotient of confidence coefficient and square root of the sample size
divided standard deviation
b. the product of confidence coefficient and standard deviation divided by the
square root of the sample size
c. the quotient of confidence coefficient and standard deviation multiplied by
the square root of the sample size
d. the product of confidence coefficient and square root of the sample size
divided by standard deviation
Question 4
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Supposed that the z is the test statistics for hypothesis testing, calculate the
value of the z for each of the following. Express your answer in 2 decimal places.
&micro; = 8.5, σ = 4, n = 99, x̄ = 7.2
34.32
Question 5
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William collected a random sample of 88 people, asking how many times they
open ABC web site per day on average, and calculated x̄ = 50.30. ABC suggests
that μ = 55, and s = 10. William thinks the actual mean is less than the website
owner claims. What is the null and alternative hypothesis?
Select one:
a. Null hypothesis &micro;
b. Null hypothesis &micro; ≥ 55, Alternative hypothesis &micro; &lt; 55
c. Null hypothesis &micro; &gt; 55, Alternative hypothesis &micro; ≤ 55
d. Null hypothesis &micro; ≠ 55, Alternative hypothesis &micro;
e. 55
f. 55, Alternative hypothesis &micro; ≠ 55
Question 6
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As the confidence interval for a given statistics increases in length, the
confidence level ___________.
Select one:
a. Equal to 1
b. Equal to zero
c. Increases
d. Decreases
Question 7
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The formula given below will give an output of
Select one:
a. Margin of Error
b. Confidence Interval for large samples
c. Confidence Coefficient Limits
d. Sample population mean
Question 8
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Values supporting the ___________________ occurs in the rejection region.
Select one:
a. Critical values
b. Null hypothesis
c. Null hypothesis and critical values
d. Alternative hypothesis and critical values
e. Alternative hypothesis
Question 9
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St. Therese senior high school have an average achievement test score of 900.
From a random sample of 169 students St. Therese students we find the
average achievement test score to be 850 with a standard deviation of 88. We
want to know if these high school students are representative of the overall
population:
What can we conclude based on the hypotheses and test statistic?
Select one:
a. Accept null hypothesis
b. Accept alternative hypothesis
c. Reject alternative hypothesis
d. Reject null hypothesis
Question 10
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Given the formula in determining the minimum sample size needed when
estimating the population proportion and if no approximation is known, what
value of p̂ will be used?
Select one:
a. 1
b. 2
c. 0.5
d. 0
Question 11
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
1.0
Select one:
a. Cannot be determined
b. Reject
c. Do not Reject
Question 12
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A type of test that is denoted by the symbol Ho.
Select one:
a. Rejection hypothesis
b. Null hypothesis
c. Statistical hypothesis
d. Alternative hypothesis
Question 13
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A survey was conducted from the 250 individuals. Based on the result of the
survey, 170 are satisfied with the current Local Government administration.
Estimate the sample proportion ̂p of those who are not satisfied based on the
sample provided.
Select one:
a. 0.68
b. 55%
c. 0.32
d. 0.
Question 14
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Sampling distribution of proportions is randomly distributed.
Select one:
a. FALSE. Replace the word proportion with “p hat”
b. FALSE. Replace the word Sampling distribution with Confidence Coefficient
c. FALSE. Replace the word randomly with normally.
d. TRUE
Question 15
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The alternative hypothesis and null hypothesis should be ________________.
Select one:
a. Mutually exclusive
b. None of the choices
c. Mutually inclusive
d. All of the choices
Question 16
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
1.20
Select one:
a. Reject
b. Do not Reject
c. Cannot be determined
Question 17
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
–4
Select one:
a. Cannot be determined
b. Do not Reject
c. Reject
Question 18
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Find the sample size given 90% confidence, Margin of Error = 0.05 and ̂p =0.30.
Select one:
a. 138
b. 301
c. 228
d. 198
Question 19
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King Lo Electronics claims that the new brand of computer will last for 25,000
hours. A research company conducted a test on the information. The company
randomly select and test 100 cellular phone. The data from the sample shows
that the mean life of the cellular phone is 20,000 hours, with a standard
deviation of 1000 hours. Determine the 95% confidence interval of the mean life
of the cellular phone.
Select one:
a. (19,804, 20,196)
b. (17,482, 18,649)
c. (23,467, 24,639)
d. (26,928, 27,375)
Question 20
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Determine whether each of the following is a null of an alternative hypothesis:
The average internet usage of a College student is 6 hours.
Null hypothesis
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Week 13: Learning Activity
Learning Activity 3
Started on
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Time taken
Saturday, 8 February 2020, 4:09 PM
Finished
Saturday, 8 February 2020, 4:11 PM
1 min 30 secs
7.00 out of 10.00 (70%)
Question 1
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A private organization telephone poll of 750 adults, aged 18 and older, living in
the country found that 60% of citizen feel confident in the accuracy of their
doctor's advice, and don't feel the need to check for a second opinion or do
additional research. The margin of error for this survey was given as &plusmn; 20
percentage points. Find a 95% confidence interval estimate of the percent of
adults who feel confident in the accuracy of their doctor’s advice and don’t feel
the need to check for a second opinion.
Select one:
a. (0.452, 0.538)
b. (0.565, 0.640)
c. (0.316, 0.483)
d. (0.490, 0.601)
Question 2
Correct
Mark 1.00 out of 1.00
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Question text
King Lo Electronics claims that the new brand of computer will last for 25,000
hours. A research company conducted a test on the information. The company
randomly select and test 100 cellular phone. The data from the sample shows
that the mean life of the cellular phone is 20,000 hours, with a standard
deviation of 1000 hours. Determine the 95% confidence interval of the mean life
of the cellular phone.
Select one:
a. (19,804, 20,196)
b. (17,482, 18,649)
c. (23,467, 24,639)
d. (26,928, 27,375)
Question 3
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Given n=20, x̄ =89, s=2, 99% confidence. Assuming that the samples come
from a normal distribution, find the margin of error.
Select one:
a. 0.89
b. 1.15
c. 1.05
d. 0.93
Question 4
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Given the sample size (n=400) and sample proportion (p=0.56), find the
approximate margin of error for the 99% confidence interval:
Select one:
a. 0.064
b. 0.043
c. 0.052
d. 0.074
Question 5
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Find the sample size given 90% confidence, Margin of Error = 0.15 and ̂p =0.25.
Select one:
a. 21
b. 22
c. 20
d. 23
Question 6
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Identify the following formula:
zα2(σn−−√)zα2(σn)
Select one:
a. Population Proportion
b. Sample Proportion
c. Margin of Error
d. Point Estimate
Question 7
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A survey of 200 people finds that they work on average of 8 hours a day. If the
margin of error at 98% confidence level is 1.2 hours. How do you compute for
the lower confidence interval?
Select one:
a. Z score plus less the square root of 8 hours less 1.2 hours
b. None of the choices
c. 8 hours less 1.2 hours multiplied by the z score at 98% confidence level
d. 8 hours less 1.2 hours
Question 8
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A survey of 900 people finds that they work on average of 9 hours a day. If the
margin of error at 98% confidence level is 1.5 hours. What is the solution to find
the lower confidence interval?
Select one:
a. All of the choices
b. Z score plus less the square root of 9 hours less 1.5 hours
c. None of the choices
d. 9 hours less 1.5 hours multiplied by the z score at 98% confidence level
e. 9 hours less 1.5 hours
Question 9
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What is in the center of the confidence interval?
Select one:
a. Population Parameter
b. Margin of Error
c. Point Estimate
d. Number of samples
Question 10
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When the confidence level is 95%, the ____________________ are +- 1.96
Select one:
a. Confidence coefficients
b. “p hat” values
c. Margin of Errors
d. Confidence intervals
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Week 20: Quarterly Exam
Second Quarter Exam
Started on
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Time taken
Marks
Saturday, 8 February 2020, 3:59 PM
Finished
Saturday, 8 February 2020, 4:09 PM
9 mins 47 secs
44.00/50.00
8.80 out of 10.00 (88%)
Question 1
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Point estimate is
Select one:
a. A statistical that estimates a population parameter
b. Equal to the population mean
c. Always equal to the number or samples
d. A range of possible values for a population parameter.
Question 2
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Values supporting the ___________________ occurs in the rejection region.
Select one:
a. Critical values
b. Null hypothesis
c. Alternative hypothesis and critical values
d. Null hypothesis and critical values
e. Alternative hypothesis
Question 3
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Question text
St. Therese senior high school have an average achievement test score of 900.
From a random sample of 169 students St. Therese students we find the
average achievement test score to be 850 with a standard deviation of 88. We
want to know if these high school students are representative of the overall
population:
What can we conclude based on the hypotheses and test statistic?
Select one:
a. Accept null hypothesis
b. Accept alternative hypothesis
c. Reject alternative hypothesis
d. Reject null hypothesis
Question 4
Correct
Mark 1.00 out of 1.00
Flag question
Question text
A building contractor/engineer is increasing his price for building projects,
claiming that the cost of labor and material is going up and accounts for 65% of
his budget. In a random sample of 30 of his projects it is found that in 20 of the
projects the cost of the material is higher.
What is the standard error of the proportion?
Select one:
a. 0.032
b. 0.0632
c. 0.051
d. 0.087
Question 5
Correct
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Given n=10, x̄ =28, s=2.0, 95% confidence. Assuming that the samples come
from a normal distribution, find the margin of error.
Select one:
a. 1.24
b. 26.76
c. 3.16
d. 0.63
Question 6
Correct
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Which of the following is INCORRECT about correlation coefficient.
Select one:
a. correlation coefficient can never be a zero value
b. correlation coefficient is the number that quantifies two aspects of
relationship between the data
c. correlation coefficient can be negative or positive
d. when correlation coefficient is equal to 1, then the data is perfectly linear
Question 7
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The alternative hypothesis and null hypothesis should be ________________.
Select one:
a. None of the choices
b. Mutually inclusive
c. All of the choices
d. Mutually exclusive
Question 8
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The graph below describes a ______________________ correlation.
Select one:
a. Perfect Negative Correlation
b. Inverse Correlation
c. Perfect Positive Correlation
d. Downline Correlation
Feedback
Question 9
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Consider the scenario: In a recent survey, 320 persons out of 35 reported that
they prefer to ride in a public utility air-conditioned vehicle rather than a
jeepney. What is the value of the test statistics?
Select one:
a. 3.49
b. – 1.33
c. – 1.85
d. – 1.85
Question 10
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Year is an example of a
Select one:
a. Trend variable
b. Response variable
c. Explanatory variable
d. Correlation variable
Question 11
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
– 0.6
Select one:
a. Cannot be determined
b. Do not Reject
c. Reject
Question 12
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Given the equation 3y = x+15, what is the y intercept?
5
Question 13
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The goal of examining bivariate data is to show some relativity or association
between two or more variables.
Select one:
a. The statement is FALSE.
b. The statement is TRUE.
Question 14
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Given the equation 5y = 20x+ 30, what is the slope?
Question
Correct
4
15
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Describe the relationship based when r value = 0.63
Select one:
a. Strong positive correction
b. Minimal positive correction
c. No apparent correlation
d. Weak positive correction
Question 16
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
3.31
Select one:
a. Cannot be determined
b. Do not Reject
c. Reject
Question 17
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A survey of 200 people finds that they work on average of 8 hours a day. If the
margin of error at 98% confidence level is 1.2 hours. How do you compute for
the lower confidence interval?
Select one:
a. Z score plus less the square root of 8 hours less 1.2 hours
b. 8 hours less 1.2 hours multiplied by the z score at 98% confidence level
c. None of the choices
d. 8 hours less 1.2 hours
Question 18
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In hypothesis testing, the computed statistics is compared to the critical value
for decision making.
Select one:
a. The statement is TRUE.
b. The statement is FALSE.
Question 19
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The “p hat” is calculated as
Select one:
a. 1- (Number of desired elements over the number of desired outcomes)
b. Number of desired outcomes over the number of desired elements
c. (Number of desired outcomes over the number of desired elements) – 1
d. Number of desired elements over the number of desired outcomes
Question 20
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Using the following data, find the lower bound of confidence interval.
n=400, p̂ = 0.75, 90% confidence
0.036
Question 21
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Given the table and graph, determine the slope intercept equation.
Select one:
a. y=5x + 1
b. y=5x + 2
c. y=10x + 2
d. y=10x + 1
Feedback
Question 22
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In the slope-intercept equation of a line, the slope of the line is represented as
the coefficient of the variable y.
Select one:
a. Cannot be determined
b. TRUE
c. FALSE
Question 23
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A _____________ is simply a scatterplot in which we connect successive
how the data values are changing over a period of time.
Select one:
a. XY Plot
b. Line plot
c. Scatter Plot
d. Correlation Plot
Question 24
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What is the null hypothesis to the claim that people like android phone than IOS?
State the null hypothesis.
Select one:
a. Less people like android and IOS phone
b. More people like IOS phone than android phone
c. More people like android than IOS phone
d. Less people like IOS than android
Question 25
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Given the following data, compute for the correlation coefficient. Round your
answer into 2 decimal places. If the answer is a whole number, do not put a
decimal after it.
Question 26
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The “p hat” is calculated as
Select one:
a. 1- (Number of desired elements over the number of desired outcomes)
b. Number of desired elements over the number of desired outcomes
c. (Number of desired outcomes over the number of desired elements) – 1
d. Number of desired outcomes over the number of desired elements
Question 27
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This measures relationship between bivariate data.
Select one:
a. None of the choices
b. Correlation
c. Linear Regression
d. Scatterplot Analysis
Question 28
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Sampling distribution of proportions is randomly distributed.
Select one:
a. FALSE. Replace the word randomly with normally.
b. FALSE. Replace the word Sampling distribution with Confidence Coefficient
c. TRUE
d. FALSE. Replace the word proportion with “p hat”
Question
29
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A type of test that is denoted by the symbol Ho.
Select one:
a. Alternative hypothesis
b. Null hypothesis
c. Rejection hypothesis
d. Statistical hypothesis
Question 30
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Given the equation 3y = 21x + 9, what is the slope?
7
Question 31
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This pattern is produced when the score of one observation is high, the score of
the other observation to be high.
Select one:
a. Positive Correlation
b. Direct Correlation
c. XY Plot
d. Negative Correlation
Question 32
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In hypothesis testing, the computed statistics is compared to the critical value
for decision making.
Select one:
a. The statement is FALSE.
b. The statement is TRUE.
Question 33
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Three characteristics of a bivariate are
Select one:
a. Dependent, independent &amp; response variables
b. X axes, Y axes &amp; points
c. Shape, direction and strength
d. Points, line, XY axes
Question 34
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
–4
Select one:
a. Cannot be determined
b. Do not Reject
c. Reject
Question 35
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Given the following data, find the margin of error. Your answer must be
in two decimal places.
Sample size = 100, Mean = 75, Standard Deviation = 20, 99% confidence
5.16
Question 36
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If the line has no slope,
Select one:
a. The line intercepts the x and y axis
b. The line is a horizontal line
c. The line lies at the x axis
d. The line is at the point of origin
Question 37
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Using the following data, find the lower bound of confidence interval.
n=700, p̂ = 0.75, 95% confidence
0.718
Question 38
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Given n=50, x̄ =250, s=4, 90% confidence. Assuming that the samples come
from a normal distribution, find the interval estimate of the population mean.
Select one:
a. (263.08, 264.67)
b. (244.71, 248.74)
c. (248.35, 251.65)
d. (249.07, 250.93)
Question 39
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Using the following data, find the margin of error. Your answer must be
in 3 decimal places.
n=700, p̂ = 0.75, 95% confidence
0.780
Question 40
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Given α=0.05 and the test statistics, decide whether the null hypothesis is to be
rejected or accepted:
2.35
Select one:
a. Cannot be determined
b. Reject
c. Do not Reject
Question 41
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Given the following data, find the margin of error. Your answer must be
in two decimal places.
Sample size = 100, Mean = 80, Standard Deviation = 20, Confidence coefficient
= 1.645
76.71
Question 42
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Year and household monthly water consumption in the Philippines
Select one:
a. Year is the explanatory variable and water consumption is the response
variable
b. Cannot be determined
c. Water consumption is the explanatory variable and year is the response
variable
Question 43
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A businessman is increasing his price for processed food, claiming that the cost
of labor and material is going up and accounts for 75% of his budget. In a
random sample of 10 of the processed food, it is found out that in 6 of the
processed food, the cost of the material is higher.
What is the test statistic for this scenario?
Select one:
a. 0.899
b. 1.095
c. 1.203
d. 0.996
Question 44
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The data had a _________________ when one variable increases, the other variable
also decreases.
Select one:
a. positive linear association
b. proportional association
c. elliptical association
d. negative linear association
Question 45
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Point estimate is
Select one:
a. Always equal to the number or samples
b. A statistical that estimates a population parameter
c. A range of possible values for a population parameter.
d. Equal to the population mean
Question 46
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This refers to the area where the value of the test statistic lies for which we will
reject the null hypothesis.
Select one:
a. Critical region
b. Null and Rejection region
c. Rejection region
d. Critical and Null region
e. Null region
f. All of the choices
g. Rejection and Critical region
h. None of the choices
Question 47
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The Engineer of the building wants to use the proportion of the population to
determine the sample size needed to interview regarding their idea about the
new color design of the building. He wants to be able to assure with probability
0.90 that his error will be most 0.10. Similar surveys during past year that 85%
approved the new color design. How large a sample does the Engineer need?
Select one:
a. 2,145
b. 1,372
c. 278
d. 196
Question 48
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Given the equation 9y = 2x + 81, what is the y intercept?
9
Question 49
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Given the sample size (n=250) and sample proportion (p=0.40), find the
approximate margin of error for the 90% confidence interval:
Select one:
a. 0.05
b. 0.07
c. 0.03
d. 0.08
Question 50
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About 30% of the male population living in an urban area smokes cigarette. A
researcher believes that male aged 16-30 are more likely smokes cigarette than
other ages in the urban area population. The researcher surveys 300 male aged
16-30 and finds that 80 of them smokes cigarette:
What is the observed value of the sample proportion?
Select one:
a. 0.419
b. 0.189
c. 0.372
d. 0.267
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