Question 1

A researcher is conducting a study on Internet use. He decides to first categorize
The population by education level (high school, college graduate, advanced degree, etc.)
And then survey a select number from each category. This sampling strategy is called
A) Systematic
B) Cluster
C) Random
D) Judgmental
E) Stratified

Accepted Answer

This sampling strategy is called stratified sampling, where the population is divided into subgroups (strata) based on a characteristic (education level), and samples are taken from each subgroup.

Question 2

A government agency has 6000 employees. As an alternative to the traditional
Five day work week, employees were asked whether they preferred a four day work week
(10 hours per day) or flexible hours. The table below shows the results by age category.
The most appropriate display for these data is a $$\begin{array} { | l | l | l | } 
\hline \text { Age Category } & \begin{array} { l } 
\text { Prefers 4 } \
\text { Day Week }
\end{array} & \begin{array} { l } 
\text { Prefers } \
\text { Flex Hours }
\end{array} \
\hline \text { Under 30 } & 600 & 300 \
\hline 30 - 45 & 1200 & 1500 \
\hline \text { Over 45 } & 2100 & 300 \
\hline
\end{array}$$
A) histogram.
B) stem and leaf display.
C) boxplot.
D) segmented bar chart.
E) frequency table.

Accepted Answer

A segmented bar chart is appropriate for displaying categorical data and comparing preferences across different age categories.

Question 3

Suppose a sample of 60 cans of soda has a mean of 12.1 ounces and a standard
Deviation of 0.05 ounces. If a can of soda has 12 ounces, what is its corresponding z
Score?
A) 2.0
B) -2.0
C) 1.8
D) -3.0
E) -1.8

Accepted Answer

B

Question 4

If a parameter is computed from a set of data, which of the following statements is
True?
A) The data are obtained from a census.
B) The data are obtained from a random sample.
C) The data is from a sample that is representative of the population.
D) The data are obtained from a stratified sample.
E) The data must be quantitative.

Accepted Answer

The answer of If a parameter is computed from a...

Question 5

A manufacturer of batteries routinely tests its products to determine lifetime
(hours of continuous usage). Suppose they select a sample of 30 AAA batteries and find
That the average lifetime is 1500 hours. This is a
A) parameter.
B) statistic.
C) sampling frame.
D) sample.
E) population.

Accepted Answer

A statistic is a numerical value that represents a characteristic of a sample, such as the average lifetime of the 30 AAA batteries in this case.

Question 6

Boxplots of earnings per share (EPS) data for a sample of retail company stocks
And a sample of energy company stocks are shown below. Which of the following
Statement is true about the distributions of EPS for retail and energy stocks? 
A) The distribution of EPS for retail stocks is skewed to the right.
B) The distribution of EPS for energy stocks is symmetric.
C) Both distributions of EPS are symmetric.
D) The distribution of EPS for retail stocks is skewed to the left.
E) The distribution of EPS for energy stocks is skewed to the left.

Accepted Answer

The answer of Boxplots of earnings per share (EPS) data...

Question 7

In their October 2003 issue, Consumer Reports evaluated the price and
Performance of 23 models of cordless phones. Computer output gives the summary
Statistics for the prices ($) shown in the table. Based on these results, which of the
Following is true? $$\begin{array} { | c | c | c | c | c | c | c | } 
\hline \text { Min } & \text { Q1 } & \text { Median } & \text { Q3 } & \text { Max } & \text { Mean } & \text { SD } \
\hline 15 & 30 & 50 & 110 & 200 & 71.75 & 52.08 \
\hline
\end{array}$$
A) The distribution is symmetric.
B) The distribution is skewed to the right.
C) The distribution is skewed to the left.
D) The mean is a better measure of center for these data than the median.
E) The standard deviation is larger than the range.

Accepted Answer

The distribution is skewed to the right because the mean is greater than the median.

Question 8

The U.S. Bureau of Labor Statistics (BLS) compiles data on a number of
Variables. Which of the following BLS variables is categorical?
A) Consumer expenditures
B) Type of workplace injuries
C) Wages by occupation
D) Employment costs
E) Productivity by industry

Accepted Answer

Type of workplace injuries is categorical because it involves classifying injuries into distinct categories or types, rather than measuring them numerically.

Question 9

A recent survey of online shoppers asked them to indicate the primary reason they
Shop via the Internet. The table summarizes responses by reason and gender. What
Percent of respondents cite Convenience as the primary reason they shop online? $$\begin{array} { | l | l | l | } 
\hline \text { Reason for Shopping Online } & \text { Male } & \text { Female } \
\hline \text { Convenience } & 249 & 90 \
\hline \text { Better Prices } & 110 & 99 \
\hline \text { Greater Selection } & 41 & 211 \
\hline
\end{array}$$
A) 42%
B) 23%
C) 62%
D) 85%
E) 33%

Accepted Answer

The total number of respondents is 249 (male) + 90 (female) + 110 + 99 + 41 + 211 = 800. The number citing Convenience is 249 + 90 = 339. The percentage is (339/800) * 100 = 42.375%, approximately 42%.

Question 10

Which is true for the data shown in the histogram?  I. The distribution is skewed to the right.
II) The mean is probably smaller than the median.
III) It is appropriate to summarize these data with the mean and standard deviation.
A) I only
B) II only
C) I and II
D) I and III
E) I, II and III

Accepted Answer

The answer of Which is true for the data shown...

Question 11

A recent survey of online shoppers asked them to indicate the primary reason they
Shop via the Internet. The table summarizes responses by reason and gender. What
Percent of males cite Convenience as the primary reason they shop online? $$\begin{array} { | l | l | l | } 
\hline \text { Reason for Shopping Online } & \text { Male } & \text { Female } \
\hline \text { Convenience } & 249 & 90 \
\hline \text { Better Prices } & 110 & 99 \
\hline \text { Greater Selection } & 41 & 211 \
\hline
\end{array}$$
A) 42%
B) 73%
C) 62%
D) 31%
E) 50%

Accepted Answer

The percentage of males citing convenience is calculated by dividing the number of males citing convenience (249) by the total number of male respondents (249 + 110 + 41 = 400) and then multiplying by 100 to get the percentage: (249/400) * 100 = 62%.

Question 12

A government agency has 6000 employees. As an alternative to the traditional
Five day work week, employees were asked whether they preferred a four day work week
(10 hours per day) or flexible hours. The segmented bar chart below is based on the data
Collected. Which of the following statements is true about work week preferences and
Age category? 
A) A greater percentage of employees who prefer a 4 day work week are in the over 45 age category compared to those who prefer flex hours.
B) A greater percentage of employees who prefer flex hours are in the over 45 age category compared to those who prefer a 4 day work week.
C) Preferences appear to be independent of age.
D) The distribution of preferences are the same across different age groups.
E) The segmented bar chart is not appropriate for these data.

Accepted Answer

The answer of A government agency has 6000 employees. As...

Question 13

A customer service center keeps track of the number of complaints received each
Day about one of their new products. The numbers of complaints received over the last
11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The median for this
Sample of data is
A) 22. 
B) 20 .
C) 19.
D) 17.
E) 16. 6

Accepted Answer

The answer of A customer service center keeps track of...

Question 14

A customer service center keeps track of the number of complaints received each
Day about one of their new products. The numbers of complaints received over the last
11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The IQR for this sample
Of data is
A) 25. 
B) 22.
C) 18.
D) 9.
E) 4.

Accepted Answer

The IQR (Interquartile Range) is calculated as Q3 - Q1. First, order the data: 16, 17, 18, 18, 19, 19, 21, 22, 22, 23, 25. The median (Q2) is 19. Q1 is the median of the first half (16, 17, 18, 18, 19), which is 18. Q3 is the median of the second half (21, 22, 22, 23, 25), which is 22. Therefore, IQR = Q3 - Q1 = 22 - 18 = 4.

Question 15

What scale of measurement is type of workplace injuries (slip and fall, stress
Related, etc.)?
A) Quantitative
B) Interval
C) Nominal
D) Ordinal
E) Numerical

Accepted Answer

Type of workplace injuries is a nominal scale because it categorizes data without any order or ranking.

Question 16

A customer service center keeps track of the number of complaints received each
Day about one of their new products. The numbers of complaints received over the last
11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The standard deviation
For this sample of data is
A) 0.842. 
B) 2.794.
C) 1.845.
D) 0.569.
E) None of the above..

Accepted Answer

The standard deviation for the given sample data is calculated to be approximately 2.794.

Question 17

The U.S. Bureau of Labor Statistics publishes the monthly CPI (consumer price
Index). This index shows the change in prices paid by urban consumers for a market
Basket of goods and services. These data are
A) Cross-sectional
B) Nominal
C) Categorical
D) Time Series
E) Ordinal

Accepted Answer

The CPI data is collected over time to show changes in prices, making it a time series data set.

Question 18

Boxplots of earnings per share (EPS) data for a sample of retail company stocks
And a sample of energy company stocks are shown below. Which of the following
Statements is correct? 
A) The median EPS is higher for energy stocks compared to retail stocks.
B) The median EPS is higher for retail stocks compared to energy stocks.
C) The IQR for the EPS data is larger for retail stocks than for energy stocks.
D) The EPS data are more variable for retail stocks than for energy stocks.
E) The mean is higher for energy stocks compared to retail stocks.

Accepted Answer

The answer of Boxplots of earnings per share (EPS) data...

Question 19

In their October 2003 issue, Consumer Reports evaluated the price and
Performance of 23 models of cordless phones. Computer output gives the summary
Statistics for the prices ($) shown in the table. The IQR for these data is $$\begin{array} { | c | c | c | c | c | c | c | } 
\hline \text { Min } & \text { Q1 } & \text { Median } & \text { Q3 } & \text { Max } & \text { Mean } & \text { SD } \
\hline 15 & 30 & 50 & 110 & 200 & 71.75 & 52.08 \
\hline
\end{array}$$
A) $ 80
B) $ 185
C) $ 55
D) $ 90
E) $52.08

Accepted Answer

The IQR is the difference between Q3 and Q1. So, IQR = 110 - 30 = 80.

Question 20

A recent survey of online shoppers asked them to indicate the primary reason they
Shop via the Internet. The table summarizes responses by reason and gender. What
Percent of respondents who cited Greater Selection as the primary reason they shop
Online were females? $$\begin{array} { | l | l | l | } 
\hline \text { Reason for Shopping Online } & \text { Male } & \text { Female } \
\hline \text { Convenience } & 249 & 90 \
\hline \text { Better Prices } & 110 & 99 \
\hline \text { Greater Selection } & 41 & 211 \
\hline
\end{array}$$
A) 53%
B) 27%
C) 50%
D) 84%
E) 42%

Accepted Answer

To find the percentage of respondents who cited Greater Selection as the primary reason and were females, divide the number of females by the total number of respondents who cited Greater Selection: $ \frac{211}{41+211} \times 100 = 84\% $.

Quiz 26: Exploring and Collecting Data

A researcher is conducting a study on Internet use. He decides to first categorize The population by education level (high school, college graduate, advanced degree, etc.) And then survey a select number from each category. This sampling strategy is called

Suppose a sample of 60 cans of soda has a mean of 12.1 ounces and a standard Deviation of 0.05 ounces. If a can of soda has 12 ounces, what is its corresponding z Score?

If a parameter is computed from a set of data, which of the following statements is True?

A manufacturer of batteries routinely tests its products to determine lifetime (hours of continuous usage) . Suppose they select a sample of 30 AAA batteries and find That the average lifetime is 1500 hours. This is a

Boxplots of earnings per share (EPS) data for a sample of retail company stocks And a sample of energy company stocks are shown below. Which of the following Statement is true about the distributions of EPS for retail and energy stocks?

The U.S. Bureau of Labor Statistics (BLS) compiles data on a number of Variables. Which of the following BLS variables is categorical?

Which is true for the data shown in the histogram? I. The distribution is skewed to the right. II) The mean is probably smaller than the median. III) It is appropriate to summarize these data with the mean and standard deviation.

A customer service center keeps track of the number of complaints received each Day about one of their new products. The numbers of complaints received over the last 11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The median for this Sample of data is

A customer service center keeps track of the number of complaints received each Day about one of their new products. The numbers of complaints received over the last 11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The IQR for this sample Of data is

What scale of measurement is type of workplace injuries (slip and fall, stress Related, etc.) ?

A customer service center keeps track of the number of complaints received each Day about one of their new products. The numbers of complaints received over the last 11 day period are 19, 18, 22, 21, 17, 18, 22, 19, 16, 23, and 25. The standard deviation For this sample of data is

The U.S. Bureau of Labor Statistics publishes the monthly CPI (consumer price Index) . This index shows the change in prices paid by urban consumers for a market Basket of goods and services. These data are

Boxplots of earnings per share (EPS) data for a sample of retail company stocks And a sample of energy company stocks are shown below. Which of the following Statements is correct?