Question 1

A magazine that publishes product reviews conducted a survey of teenagers'
Preferences for cell phones. Three brands of cell phone designed specifically with teens
In mind were the focus of the study. The table summarizes responses by brand and
Gender. What percent of teenagers preferred LG Rumor? $$\begin{array} { | l | l | l | } 
\hline \text { Cell Phone } & \text { Male } & \text { Female } \
\hline \text { LG Rumor } & 55 & 87 \
\hline \text { Sidekick LX } & 99 & 150 \
\hline \text { BlackJack II } & 196 & 113 \
\hline
\end{array}$$

Accepted Answer

The total number of teenagers surveyed is 55 + 87 + 99 + 150 + 196 + 113 = 700. The number of teenagers who preferred LG Rumor is 55 + 87 = 142. The percentage is (142/700) * 100% = 20.29%, which rounds to 20%.

Question 2

A magazine that publishes product reviews conducted a survey of teenagers'
Preferences for cell phones. Three brands of cell phone designed specifically with teens
In mind were the focus of the study. The table summarizes responses by brand and
Gender. Which of the following charts would be appropriate for displaying the marginal
Distribution of brands? $$\begin{array} { | l | l | l | } 
\hline \text { Cell Phone } & \text { Male } & \text { Female } \
\hline \text { LG Rumor } & 55 & 87 \
\hline \text { Sidekick LX } & 99 & 150 \
\hline \text { BlackJack II } & 196 & 113 \
\hline
\end{array}$$

Accepted Answer

A pie chart is appropriate for displaying the marginal distribution of brands as it shows the proportion of each brand in relation to the whole.

Question 3

An office supply chain has stores in two locations, Dayton and Scranton. One of
These stores is to be closed within the coming year, and to help make the decision,
Management reviews sales data. Below are boxplots for monthly unit sales for both
Locations. 
Which of the following statement is not correct?

Accepted Answer

The answer of An office supply chain has stores in...

Question 4

A researcher is conducting a study on eating disorders. Using a list of recent
Participants in the online Weight Watchers program, she randomly selects a name from
The alphabetized list. She then chooses every tenth person from that point on to include
In her study. This sampling strategy is called

Accepted Answer

This sampling strategy is called systematic sampling, where the researcher selects every nth participant from a list.

Question 5

In 2002 data were collected on the percent of people in the U.S. not covered by
Health insurance. Summary statistics and a histogram for these data are shown below.
The IQR for these data is $$\begin{array}{l}
\begin{array} { | c | c | c | c | c | c | c | } 
\hline \text { Min } & \text { Q1 } & \text { Median } & \text { Q3 } & \text { Max } & \text { Mean } & \text { SD } \
\hline 7.9 & 10.8 & 13.4 & 16.7 & 25.8 & 13.9 & 3.6 \
\hline
\end{array}\
\end{array}$$

Accepted Answer

The answer of In 2002 data were collected on the...

Question 6

Real estate agencies also keep track of housing prices in a given area. Suppose
They also provide their clients with quarterly median selling prices for homes in a given
Area for the past three year period. These data are

Accepted Answer

The data is time series because it involves tracking median selling prices over a period of time (quarterly over three years).

Question 7

Below is a stem and leaf display of prices for a sample homes recently sold in a
Metropolitan area in the southeastern region of the U.S.
Stem-and-Leaf Display: Home Prices Stem-and-leaf of Home Prices $ N=13 $
 Leaf Unit $ =10000 $

$ \begin{array}{cll}4 & 1 & 5788 \ \text { (4) } & 2 & 0123 \ 5 & 2 & 89 \ 3 & 3 & 0 \ 2 & 3 & 5 \ 1 & 4 & 0\end{array} $

Which of the following statements is true?

Accepted Answer

This distribution is right skewed because the mean would be greater than the median.

Question 8

In listing a property, real estate agencies provides information on a number of
Variables. Which of the following variables related to property listings is categorical?

Accepted Answer

The style of home is a categorical variable because it describes a characteristic or quality of the property that can be divided into categories, such as "ranch," "colonial," or "bungalow," rather than a numerical value.

Question 9

A magazine that publishes product reviews conducted a survey of teenagers'
Preferences for cell phones. Three brands of cell phone designed specifically with teens
In mind were the focus of the study. The table summarizes responses by brand and
Gender. What percent of teenagers who preferred the BlackJack II were males? $$\begin{array} { | l | l | l | } 
\hline \text { Cell Phone } & \text { Male } & \text { Female } \
\hline \text { LG Rumor } & 55 & 87 \
\hline \text { Sidekick LX } & 99 & 150 \
\hline \text { BlackJack II } & 196 & 113 \
\hline
\end{array}$$

Accepted Answer

The total number of teenagers who preferred the BlackJack II is 196 males + 113 females = 309. The percentage of males is (196/309) * 100% ≈ 63%.

Question 10

A magazine that publishes product reviews conducted a survey of teenagers'
Preferences for cell phones. Three brands of cell phone designed specifically with teens
In mind were the focus of the study. The table summarizes responses by brand and
Gender. What percent of female teenagers preferred the Sidekick LX? $$\begin{array} { | l | l | l | } 
\hline \text { Cell Phone } & \text { Male } & \text { Female } \
\hline \text { LG Rumor } & 55 & 87 \
\hline \text { Sidekick LX } & 99 & 150 \
\hline \text { BlackJack II } & 196 & 113 \
\hline
\end{array}$$

Accepted Answer

The answer of A magazine that publishes product reviews conducted...

Question 11

An advocacy group is investigating whether gender has an effect on job category
In large investment firms. She surveyed a sample of firms with the results shown below.
Which of the following statements is true about gender and job category?

Accepted Answer

The answer of An advocacy group is investigating whether gender...

Question 12

A researcher is conducting a study to determine how knowledgeable teenagers are
About making good food choices. She decides to interview teenagers eating at a fast food
Restaurant. The results may be biased because this is a

Accepted Answer

The sample is biased because it is a convenience sample, as the researcher is only interviewing teenagers who are easily accessible at a fast food restaurant, which may not represent the general population of teenagers.

Question 13

Which is true of the data shown in the histogram?  I. The distribution is approximately symmetric.
II) The mean and median are approximately equal.
III) The median and IQR summarize the data better than the mean and standard
Deviation.

Accepted Answer

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

Question 14

An advocacy group is investigating whether gender has an effect on job category
In large investment firms. She surveyed a sample of firms with the results shown below.
The most appropriate display for these data is a $$\begin{array} { | l | l | l | } 
\hline \text { Job Category } & \text { Male } & \text { Female } \
\hline \text { Clerical / Technical } & 85 & 215 \
\hline \text { Professional Staff } & 720 & 480 \
\hline \text { Executive / Managerial } & 400 & 100 \
\hline
\end{array}$$

Accepted Answer

A segmented bar chart is appropriate for displaying categorical data and comparing the distribution of job categories between males and females.

Question 15

What scale of measurement is the style of a home (colonial, split level, ranch etc)?

Accepted Answer

The style of a home is a categorical variable that names or labels categories without implying any order, making it a nominal scale of measurement.

Question 16

In 2002 data were collected on the percent of people in the U.S. not covered by
Health insurance. Summary statistics and a histogram for these data are shown below.
What is the most appropriate measure to describe the center of these data? $$\begin{array}{l}
\begin{array} { | c | c | c | c | c | c | c | } 
\hline \text { Min } & \text { Q1 } & \text { Median } & \text { Q3 } & \text { Max } & \text { Mean } & \text { SD } \
\hline 7.9 & 10.8 & 13.4 & 16.7 & 25.8 & 13.9 & 3.6 \
\hline
\end{array}\
\end{array}$$

Accepted Answer

The answer of In 2002 data were collected on the...

Question 17

A manufacturer of cable wire periodically selects samples to monitor the process.
A sample of ten wires is selected and the diameters (in cm.) are 0.493, 0.534, 0.527,0.511, 0.565, 0.559, 0.519, 0.562, 0.551, and 0.530. The mean diameter is

Accepted Answer

The mean diameter is calculated by adding up all the diameters and dividing by the number of wires (10). Using a calculator or spreadsheet, we get: (0.493+0.534+0.527+0.511+0.565+0.559+0.519+0.562+0.551+0.53)/10 = 0.535 cm. Therefore, the best choice is B.

Question 18

A manufacturer of cable wire periodically selects samples to monitor the process.
A sample of ten wires is selected and the diameters (in cm.) are 0.493, 0.534, 0.527,0.511, 0.565, 0.559, 0.519, 0.562, 0.551, and 0.530. The standard deviation is

Accepted Answer

The answer of A manufacturer of cable wire periodically selects...

Question 19

A researcher is conducting a study on eating disorders. Using a list of recent
Participants in the online Weight Watchers program, she randomly selects a sample from
The alphabetized list. This list represents the

Accepted Answer

The sampling frame is the list of recent participants in the online Weight Watchers program.

Question 20

For families who live in apartments the correlation between the family's income
And the amount of rent they pay is r = 0.60. Which is true?
I. In general, families with higher incomes pay more in rent.
II. On average, families spend 60% of their income on rent.
III. The regression line passes through 60% of the (income$, rent$) data
Points.

Accepted Answer

A correlation of r = 0.60 indicates a positive relationship, meaning that generally, as income increases, rent also increases. However, it does not imply that families spend 60% of their income on rent or that the regression line passes through 60% of the data points.

Quiz 26: Exploring and Collecting Data

A researcher is conducting a study on eating disorders. Using a list of recent Participants in the online Weight Watchers program, she randomly selects a name from The alphabetized list. She then chooses every tenth person from that point on to include In her study. This sampling strategy is called

Real estate agencies also keep track of housing prices in a given area. Suppose They also provide their clients with quarterly median selling prices for homes in a given Area for the past three year period. These data are

In listing a property, real estate agencies provides information on a number of Variables. Which of the following variables related to property listings is categorical?

An advocacy group is investigating whether gender has an effect on job category In large investment firms. She surveyed a sample of firms with the results shown below. Which of the following statements is true about gender and job category?

A researcher is conducting a study to determine how knowledgeable teenagers are About making good food choices. She decides to interview teenagers eating at a fast food Restaurant. The results may be biased because this is a

Which is true of the data shown in the histogram? I. The distribution is approximately symmetric. II) The mean and median are approximately equal. III) The median and IQR summarize the data better than the mean and standard Deviation.

What scale of measurement is the style of a home (colonial, split level, ranch etc) ?

A manufacturer of cable wire periodically selects samples to monitor the process. A sample of ten wires is selected and the diameters (in cm.) are 0.493, 0.534, 0.527,0.511, 0.565, 0.559, 0.519, 0.562, 0.551, and 0.530. The mean diameter is

A manufacturer of cable wire periodically selects samples to monitor the process. A sample of ten wires is selected and the diameters (in cm.) are 0.493, 0.534, 0.527,0.511, 0.565, 0.559, 0.519, 0.562, 0.551, and 0.530. The standard deviation is

A researcher is conducting a study on eating disorders. Using a list of recent Participants in the online Weight Watchers program, she randomly selects a sample from The alphabetized list. This list represents the