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Question 1
2 out of 2 points
In a production line, the average number of defective products is 20 with a standard deviation of 2.1. What is the probability that the number of defective products will be lower than 15?
Selected Answer:
0. 87%
Answers:
0. 87%
49.13%
50.87%
99.13%
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Question 2
2 out of 2 points
Using a sample to make generalizations about an aspect of a population is called
Selected Answer:
statistical inference.
Answers:
data mining.
descriptive statistics.
random sampling.
statistical inference.
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Question 3
2 out of 2 points
A single extremely large value can affect the median more than the mean.
Selected Answer:
False
Answers:
True
False
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Question 4
2 out of 2 points
The mean of the number of sales of cars over a three-month period is 82 and the standard deviation is 6. The mean of the commissions is ₱5,225 and the standard deviation is ₱775.Compare the
variations of the two.
Selected Answer:
Sales is less variable than commission.
Answers:
Sales is less variable than commission.
Sales is more variable than commission.
Their coefficients of variation are equal.
none of these
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Question 5
2 out of 2 points
To qualify for a police academy, candidates must score in the top 10% on the general abilities test. Assume the test scores are normally distributed and the test has a mean of 180 and standard
deviation of 17. Find the lowest possible score to qualify?
Selected Answer:
202
Answers:
202
226
198
225
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Question 6
2 out of 2 points
The market researcher of a manufacturing company constructs a graph showing the fluctuations in sales for a major product line during the last five years. It illustrates the use of inferential
statistics.
Selected Answer:
False
Answers:
True
False
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Question 7
2 out of 2 points
Which is least likely to be an application where statistics will be useful?
Selected Answer:
Choosing the wording of a corporate policy prohibiting smoking
Answers:
Predicting whether an airfare is likely to rise or fall
Designing the most desirable places for a Palawan tour
Deciding whether offering Rice Krispies improves restaurant sales
Choosing the wording of a corporate policy prohibiting smoking
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Question 8
2 out of 2 points
10 accountancy students of UST were asked about their soft drink preference. The responses are: pepsi, coke, coke, pepsi, pop, pepsi, coke, coke, pop and pepsi. The distribution is ___________.
Selected Answer:
bimodal
Answers:
bimodal
bell-shaped
unimodal
symmetric
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Question 9
The weights (in pounds) of seven army recruits are 181, 201, 220, 191, 219, 209, and 186.The computed quartile deviation is ____.
Selected Answer:
0 out of 2 points
16.5
Answers:
16.5
33
186
219
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Question 10
2 out of 2 points
Which of the following statements is not true?
Selected Answer:
Estimating parameters is an important aspect of descriptive statistics.
Answers:
Statistics helps refine theories through ongoing hypothesis testing.
Statistics is the science of collecting, organizing, analyzing, interpreting, and presenting data.
Estimating parameters is an important aspect of descriptive statistics.
Statistical challenges include imperfect data and practical constraints.
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Question 11
2 out of 2 points
Because 25 percent of the students in my morning statistics class watch eight or more hours of television a week, I conclude that 25 percent of all students at the university watch eight or more
hours of television a week. The most important logical weakness of this conclusion would be
Selected Answer:
using a sample that may not be representative of all students.
Answers:
relying on a sample instead of surveying every student.
using a sample that may not be representative of all students.
failing to correct for unconscious interviewer bias.
assuming cause and effect where none exists.
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Question 12
2 out of 2 points
A comparison of infant formula prices at 4 randomly selected grocery stores in Manila showed increases from the previous month of 13, 15, 17, and 19 pesos for a 900-gram can. If each of the
increases given is multiplied by 2, what happened to the range?
Selected Answer:
doubled
Answers:
doubled
no change
reduced by half
tripled
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Question 13
2 out of 2 points
Which is not a likely task of descriptive statistics?
Selected Answer:
Estimating unknown parameters
Answers:
Summarizing a sample
Describing data numerically
Estimating unknown parameters
Making visual displays of data
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Question 14
2 out of 2 points
The geometric mean rate of return measures the rate of change of a variable over time.
Selected Answer:
True
Answers:
True
False
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Question 15
2 out of 2 points
A comparison of infant formula prices at 4 randomly selected grocery stores in Manila showed increases from the previous month of 13, 15, 17, and 19 pesos for a 900-gram can. If each of the
increases given is multiplied by 2, what happened to the standard deviation?
Selected Answer:
doubled
Answers:
doubled
no change
reduced by half
tripled
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Question 16
2 out of 2 points
Which of the following statements is correct?
Selected Answer:
Statistics is the science of collecting, organizing, analyzing, interpreting, and presenting data.
Answers:
A parameter is a measure that is calculated from a sample.
Statistics is the science of collecting, organizing, analyzing, interpreting, and presenting data.
For day-to-day business data analysis, most firms rely on a large staff of expert statisticians.
A statistical test result that is significant also has practical importance.
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Question 17
Which of the following does not illustrate inferential methods?
2 out of 2 points
Selected Answer:
None of the above.
Answers:
Interval estimation of population means.
Hypothesis testing of two independent population means.
Regression and correlation analysis between variables of interest.
None of the above.
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Question 18
2 out of 2 points
Quantitative variables use which two levels of measurement?
Selected Answer:
Interval and ratio
Answers:
Ordinal and ratio
Interval and ordinal
Nominal and ordinal
Interval and ratio
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Question 19
2 out of 2 points
A time-series plot is used to study patterns in the values of a numerical variable over time.
Selected Answer:
True
Answers:
True
False
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Question 20
Which variable is least likely to be regarded as ratio data?
2 out of 2 points
Selected Answer:
Student's evaluation of a professor's teaching (Likert scale)
Answers:
Length of time required for a randomly chosen vehicle to cross a toll bridge (minutes)
Weight of a randomly chosen student (pounds)
Number of fatalities in a randomly chosen traffic disaster (persons)
Student's evaluation of a professor's teaching (Likert scale)
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Question 21
2 out of 2 points
Which of the following does not illustrate normality for an actual data?
Selected Answer:
The interquartile range equals 2.33 standard deviations.
Answers:
The interquartile range equals 2.33 standard deviations.
The mean, median, and mode coincide.
The shape is symmetrical and bell-shaped.
The variable is infinitely continuous.
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Question 22
2 out of 2 points
A population is of size 5,500 observations. When the data are represented in a relative frequency distribution, the relative frequency of a given interval is 0.15. The frequency in this interval is equal
to
Selected Answer:
825
Answers:
4,675
800
675
825
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Question 23
2 out of 2 points
Which of the following properties of the normal curve is not true?
Selected Answer:
The tails of the curve are asymptotic relative to the horizontal axis.
Answers:
It is a bell-shaped curve with the highest point under the mean.
The area under the normal curve is equal to one.
The curve is symmetrical about the vertical axis through the mean.
The tails of the curve are asymptotic relative to the horizontal axis.
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Question 24
2 out of 2 points
IQ scores of accountancy students studying in UST is an example of interval data.
Selected Answer:
True
Answers:
True
False
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Question 25
0 out of 2 points
Which of the following refers to a sample?
Selected Answer:
A batch of electronic parts ready for inspection.
Answers:
The score of gymnasts in his first attempt in her routine exercise.
A batch of electronic parts ready for inspection.
The list of all possible outcomes in rolling a die twice.
The second-year accountancy students for the academic year 2021 to 2022.
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Question 26
2 out of 2 points
Which of the following is numerical data?
Selected Answer:
The fuel economy (MPG) of your car
Answers:
Student number
The brand of cell phone you own
Whether you have a credit card
The fuel economy (MPG) of your car
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Question 27
2 out of 2 points
A survey of 18 high-tech firms showed the number of days' inventory they had on hand. Determine if the data are approximately distributed.5 29 34 44 45 63 68 74 74 81 88 91 97 98 113 118 151
158. Which of the following is not correct?
Selected Answer:
The mean and the median are equal to 79.5.
Answers:
The histogram is approximately bell-shaped.
The Pearson coefficient of skewness is equal to 0.148, so the distribution is not significantly skewed
The given data has no outliers.
The mean and the median are equal to 79.5.
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Question 28
Which of the following is called the bell-shaped curve that shows typical equal distribution of data?
2 out of 2 points
Selected Answer:
mesokurtic
Answers:
leptokurtic
mesokurtic
platykurtic
skewed to the right
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Question 29
2 out of 2 points
The area under the normal curve to the right of z=1.43 is 42.36%.
Selected Answer:
False
Answers:
True
False
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Question 30
2 out of 2 points
A comparison of infant formula prices at 4 randomly selected grocery stores in Manila showed increases from the previous month of 13, 15, 17, and 19 pesos for a 900-gram can. If each of the
increases given is multiplied by 2, what happened to the mean?
Selected Answer:
doubled
Answers:
doubled
no change
reduced by half
tripled
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Question 31
2 out of 2 points
If the mean is greater than the median, then the distribution of the scores is right-skewed.
Selected Answer:
True
Answers:
True
False
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Question 32
2 out of 2 points
The measures of variability functions as a measure of risk or uncertainty in the field of finance.
Selected Answer:
True
Answers:
True
False
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Question 33
2 out of 2 points
What statistical table must be used to show the number graduates who passed or failed in the licensure examination for lawyers, nurses, accountants, engineers and teachers?
Selected Answer:
contingency table
Answers:
contingency table
dot plot
frequency distribution table
stem-and-leaf design
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Question 34
2 out of 2 points
An employee received an efficiency rating of 1.5 in standard score. What is his corresponding score if the mean was 110.5 with a standard deviation of 25.5?
Selected Answer:
148.75
Answers:
72.25
148.75
178.25
206.25
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Question 35
2 out of 2 points
In sampling, the very first step is to _____.
Selected Answer:
find the population size
Answers:
apply lottery method
come up with the sampling frame
compute the sample size
find the population size
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Question 36
2 out of 2 points
Following are the statistics scores of 11 students: 655, 658, 660, 663, 670, 675, 676, 678, 680, 681 and 683. The distribution of scores is ___.
Selected Answer:
skewed to the left
Answers:
skewed to the left
normal
symmetric
skewed to the right
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Question 37
2 out of 2 points
The mean grade of a class is 84% with standard deviation of 5.5%. What is the corresponding standard score of a student whose grade is 90%?
Selected Answer:
1.09
Answers:
-1.09
0.27
1.09
6
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Question 38
2 out of 2 points
Find the area under the normal curve between z = 2.47 and z = 1.58.
Selected Answer:
0.0503
Answers:
0.0503
0.4429
0. 4932
0.9361
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Question 39
2 out of 2 points
Which is not a likely area of application of statistics in business?
Selected Answer:
Questioning the executives' strategic decisions
Answers:
Auditing supplier invoices for correct payment
Questioning the executives' strategic decisions
Looking for patterns in a large marketing database
Making forecasts of several key product lines
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Question 40
2 out of 2 points
The college entrance exam scores of 15 student applicants in a university are: 76.1, 77.5, 80.1, 80.2, 82.8, 85.8, 86.4, 88.6, 88.8, 91.2, 91.2, 92.2, 93.7, 93.7, and 96.1. If the college decides to accept
applicants who belong to the top 75%, what is the cut off score?
Selected Answer:
92.2
Answers:
90.24
91.5
92.2
93.4
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Question 41
2 out of 2 points
Which of the following graphical method of data presentation is best to show a monthly family budget?
Selected Answer:
pie graph
Answers:
bar
ogive
pictogram
pie graph
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Question 42
If the level of performance is described as low, average or high, what is the scale of measurement?
2 out of 2 points
Selected Answer:
ordinal
Answers:
nominal
ordinal
interval
ratio
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Question 43
2 out of 2 points
The ordinal level of measurement classifies data into categories that can be ranked; however, precise differences between ranks do not exist.
Selected Answer:
True
Answers:
True
False
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Question 44
2 out of 2 points
The college entrance exam scores of 15 student applicants in a university are: 76.1, 77.5, 80.1, 80.2, 82.8, 85.8, 86.4, 88.6, 88.8, 91.2, 91.2, 92.2, 93.7, 93.7, and 96.1. If the college decides to accept
applicants who belong to the top 60%, how many will be accepted?
Selected Answer:
6
Answers:
3
6
7
4
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Question 45
2 out of 2 points
The weights (in pounds) of seven army recruits are 181, 201, 220, 191, 219, 209, and 186. The median of the weights of the army recruits is ____.
Selected Answer:
201
Answers:
220
180
201
221
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Question 46
2 out of 2 points
Which of the following is least useful in visualizing categorical data?
Selected Answer:
Line chart
Answers:
Bar chart
Pie chart
Line chart
Pareto chart
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Question 47
2 out of 2 points
The difference between the 1st and 3rd quartile values of a given data.
Selected Answer:
interquartile range
Answers:
five - number summary
interquartile range
point estimate
skewness
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Question 48
2 out of 2 points
If a person's score on an exam corresponds to the 85th percentile, then that person obtained 85 correct answers out of 100 questions.
Selected Answer:
False
Answers:
True
False
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Question 49
2 out of 2 points
Which is not a practical constraint facing the business researcher or data analyst?
Selected Answer:
Survey respondents usually will tell the truth if well compensated.
Answers:
Time and money are always limited.
The world is no laboratory, so some experiments are impractical.
Research on human subjects is fraught with danger and ethical issues.
Survey respondents usually will tell the truth if well compensated.
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Question 50
2 out of 2 points
It is a numerical measure used to describe a sample.
Selected Answer:
statistic
Answers:
parameter
measures of average
measures of variability
statistic