# MATH 221 Week 1 Homework Quiz

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Week 1: Homework: Statistics for Decision-Making - 10586
WEEK 1: HOMEWORK
Due Oct 6 at 11:59pm
Points 40
Questions 20
Available Sep 2 at 12am - Oct 27 at 11:59pm about 2 months
Allowed Attempts Unlimited
Time Limit None
Instructions
Click here to work on the homework set. You can re-do this assignment as often as you need. Be sure to
have the Week 1 Excel spreadsheet available to help with the calculations. It is provided in Week 1:
Resources.
Take the Quiz Again
Attempt History
Attempt
Time
Score
KEPT
Attempt 1
66 minutes
31.2 out of 40
LATEST
Attempt 2
46 minutes
22 out of 40
Attempt 1
66 minutes
31.2 out of 40
 Correct answers are hidden.
Score for this attempt: 22 out of 40
Submitted Sep 20 at 7:36pm
This attempt took 46 minutes.
Question 1
2 / 2 pts
A recent survey of the alumni of a university indicated that the average
salary of 10,000 of its 200,000 graduates was \$130,000. The \$130,000
would be considered a:
Top
Population
Parameter
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Sample
Statistic
Question 2
2 / 2 pts
In a survey of 1000 adults, 34% found they prefer charcoal to gas grills.
The 1000 would be considered a:
Population
Parameter
Sample
Statistic
Incorrect
Question 3
0 / 2 pts
The average age of students in a statistics class is 28 years. The 28
years would be considered an example of:
A population
Inferential statistics
Descriptive statistics
Top
Qualitative data
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Week 1: Homework: Statistics for Decision-Making - 10586
Question 4
0 / 2 pts
The milligrams of tar in 30 cigarettes would be considered:
Ratio data
Nominal data
Ordinal data
Interval data
Question 5
2 / 2 pts
Marriage status (married, single, etc.) of the faculty at a university would
be considered:
Ratio data
Ordinal data
Qualitative data
Quantitative data
Question 6
2 / 2 pts
Top(for example, Asian, European, etc.) listed in a recent
The nationalities
survey would be considered:
Ratio data
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Nominal data
Interval data
Ordinal data
Question 7
2 / 2 pts
Five statistics classes out of 20 are selected and all the students in the
selected classes are interviewed. This sampling technique is called:
Random
Convenience
Cluster
Stratified
Incorrect
Question 8
0 / 2 pts
A researcher obtained a random sample of 100 smokers and a random
sample of 100 non-smokers. After interviewing all 200 participants, the
researcher compared the rates of depression between the two groups.
This study design would be considered:
Observational
Top
Experimental
Simulation
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Survey
Question 9
2 / 2 pts
Which of the following would be the mean of this data set: 5, 28, 12, 56,
4, 2, 30, 21
19.75
16.50
18.24
17.06
Question 10
2 / 2 pts
Which of the following would be the standard deviation of this sample
data set: 67, 54, 30, 77, 92, 41, 75, 81
64.6
517.0
21.2
19.9
Top
Question 11
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2 / 2 pts
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Which of the following would be the variance of this population data set:
3, 6, 8, 9, 4, 5, 7, 1, 9, 7, 5, 4, 13, 9
12.00
9.49
2.97
8.82
Incorrect
Question 12
0 / 2 pts
What is the relationship between variance and standard deviation?
Variance is the square of the standard deviation
Standard deviation is the square of the variance
Variance is double the standard deviation
Standard deviation is double the variance
Incorrect
Question 13
0 / 2 pts
If data set A has a smaller standard deviation than data set B, what
would be different about their distributions?
Top
Data set A would have more data near the center of the distribution
Data set A would have most of its data to one side of the distribution
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Data set A would have flatter distribution with more data in each tail
Data set A would have a larger mean
Question 14
2 / 2 pts
In a normally distributed data set with a mean of 24 and a standard
deviation of 4.2, what percentage of the data would be between 19.8
and 28.2 and why?
68% based on the Empirical Rule
95% based on the histogram
68% based on the histogram
95% based on the Empirical Rule
Incorrect
Question 15
0 / 2 pts
Which of the following data sets would you expect to have the highest
standard deviation?
Speed of cars during a professional car race (in mph)
Ages of kids in a preschool program (in years)
Prices of used cars (in dollars)
Top
Height of pit bulls (in inches)
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Week 1: Homework: Statistics for Decision-Making - 10586
Question 16
0 / 2 pts
Which data outcome of the number of customers in line would best
support opening another cash register?
High mean with high standard deviation
Low mean with high standard deviation
High mean with small standard deviation
Low mean with small standard deviation
Incorrect
Question 17
0 / 2 pts
In manufacturing, cluster sampling could be used to determine if the
machines are operating correctly. Which of the following best describes
this type of sampling?
Samples are randomly selected throughout the day
Products are put into groups and some are randomly selected from each
group
Products are put into groups and all are included from several randomly
selected groups
Topproduct in the line is selected
Every 10th
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0 / 2 pts
Question 18
A graph shows vertical bars with the number of data points on the y-axis
and groups on the x-axis. This graphic is most likely to be:
A dot plot
A stem-leaf plot
A frequency histogram
A frequency polygon
2 / 2 pts
Question 19
Match the terms and their definitions
Vertical bar chart that
Histogram
shows frequency on the yaxis
A sample where the
population is divided into
Cluster sample
groups and several
groups are randomly
selected from all from
those selected groups are
sampled
Collection of all counts
Popula on
that are of interest
Top
A subset or part of a
population
Sample
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A sample where the
Stra ﬁed sample
population is divided into
groups and several are
randomly sampled form
each group
Consists of attributes,
Qualita ve data
labels, or nonnumerical
entries
2 / 2 pts
Question 20
Match the terms and their definitions
The most frequent number
Mode
appearing in a dataset
The average
Mean
The percentage of data
Empirical Rule
that falls within 1, 2, or 3
standard deviations of the
mean in a symmetrical,
bell-shaped distribution
The square root of the
Standard devia on
variance
Show how far a particular
data point is from the
Standard score
mean in terms of the
Top
number of
standard
deviations
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Quiz Score: 22 out of 40
Top
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