Question 1

In purchasing an automobile,there are a number of variables to consider.The body style of the car (sedan,coupe,wagon,etc. )is an example of a(n)____________________ variable.

Accepted Answer

The answer of In purchasing an automobile,there are a number...

Question 2

The Chief of Police conducted a survey of the officers on his squad.An officer's shooting score at target practice is an example of a(n)____________________ variable.

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The answer of The Chief of Police conducted a survey...

Question 3

The Dean of Students conducted a survey on campus.The gender of each student is an example of a(n)____________________ variable.

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The answer of The Dean of Students conducted a survey...

Question 4

The Dean of Students conducted a survey on campus.Class rank (Freshman,Sophomore,Junior,and Senior)is an example of a(n)____________________ variable.

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The answer of The Dean of Students conducted a survey...

Question 5

Explain why religious preference is not an ordinal variable.

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The answer of Explain why religious preference is not an...

Question 6

In purchasing a used computer,there are a number of variables to consider.The age of the computer is an example of a(n)____________________ variable.

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The answer of In purchasing a used computer,there are a...

Question 7

Give an example of interval data that can also be treated as ordinal data and nominal data.

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The answer of Give an example of interval data that...

Question 8

From a pie chart you are able to find the frequency for each category.

Accepted Answer

A pie chart displays the relative sizes of data categories as sectors of a circle, showing percentages or proportions, but it does not directly provide the frequency (actual count) of each category unless the total number of observations is known.

Question 9

Which situation identifies when to use pie charts and/or bar charts?
A) You want to describe a single set of data.
B) Your data is nominal.
C) You want to show the number or the percentage of individuals in each category.
D) All of these choices are true.

Accepted Answer

Pie charts and bar charts are appropriate when you want to describe a single set of data, your data is nominal, and when you want to show the number or percentage of individuals in each category. Therefore, choice D is the best answer.

Question 10

Suppose you measure the number of minutes it takes an employee to complete a task,where the maximum allowed time is 5 minutes,and each time is rounded to the nearest minute.Data from 130 employees is summarized below.How long did it take most employees to complete the task? $$\begin{array} { | l | c c c c c | } 
\hline \text { Time (minutes) } & 1 & 2 & 3 & 4 & 5 \
\hline \text { Frequency } & 25 & 40 & 50 & 35 & 30 \
\hline
\end{array}$$
A) 5 minutes
B) 3 minutes
C) 30 minutes
D) 50 minutes

Accepted Answer

The maximum allowed time is 5 minutes and each time is rounded to the nearest minute. Therefore, the highest possible time that can be recorded is 5 minutes. Although 30 employees took exactly 5 minutes, there were more employees who took less time. The mode, which is the value that appears most frequently, is 3 minutes with 50 employees taking this time. Therefore, it can be inferred that most employees took 3 minutes to complete the task.

Question 11

Which of the following statements about pie charts is false?
A) A pie chart is a graphical representation of a relative frequency distribution.
B) You can always determine frequencies for each category by looking at a pie chart.
C) The total percentage of all the slices of a pie chart is 100%.
D) The area of a slice of a pie chart is the proportion of all the individuals that fall into that particular category.

Accepted Answer

While a pie chart can visually represent relative frequencies, it only shows the proportion of each category in relation to the whole. It does not provide actual frequencies.

Question 12

The final grade received in a Literature course (A,B,C,D,or F)is an example of a(n)____________________ variable.

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The answer of The final grade received in a Literature...

Question 13

Which of the following situations is best suited for a pie chart?
A) The number of dollars spent this year on each type of legal gambling.
B) The percentage of a charitable donation that goes to administrative costs vs.directly to the charity.
C) The number of students in your class who received an A,B,C,D,F on their exam.
D) All of these choices are true.

Accepted Answer

Pie charts are best used to show parts of a whole, making them ideal for displaying the breakdown of a single total into its component parts, such as how a charitable donation is divided.

Question 14

Provide one example of ordinal data;one example of nominal data;and one example of interval data.

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The answer of Provide one example of ordinal data;one example...

Question 15

Explain the difference between ordinal data and interval data.

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The answer of Explain the difference between ordinal data and...

Question 16

A frequency distribution lists the categories and the proportion with which each occurs.

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The answer of A frequency distribution lists the categories and...

Question 17

Bar and pie charts are graphical techniques for nominal data.The former focus the attention on the frequency of the occurrences of each category,and the later emphasizes the proportion of occurrences of each category.

Accepted Answer

Bar charts display the frequency of occurrences for each category using rectangular bars of equal width, while pie charts show the proportion of occurrences of each category as a fraction of a whole circle.

Question 18

A relative frequency distribution lists the categories and their counts.

Accepted Answer

A relative frequency distribution lists the categories and their proportions or percentages, not just their counts.

Question 19

A bar chart is used to represent interval data.

Accepted Answer

The answer of A bar chart is used to represent...

Question 20

One of the advantages of a pie chart is that it clearly shows that the total percentages of all the categories add to 100%.

Accepted Answer

This is a defining characteristic of a pie chart. The whole pie represents 100% and each slice represents a portion of that whole.

Quiz 2: Graphical Descriptive Techniques I