ANS: A PTS: 1 REF: 5 TOP: 13

Chapter 1—Describing Data with Graphs

MULTIPLE CHOICE

• Which of the following choices best describes the methods dealt with by the branch of

statistics called descriptive statistics?

• organizing and summarizing data
• quantifying and summarizing data
• qualifying and quantifying data
• qualifying and organizing data

ANS: A PTS: 1 REF: 5 TOP: 1–3

BLM: Remember

• How is the relative frequency of a class computed?
• by dividing the frequency of the class by the number of classes
• by dividing the frequency of the class by the class width
• by dividing the frequency of the class by the total number of observations in the

data set

• by dividing the frequency of the class by one less than the total number of

observations in the data set

ANS: C PTS: 1 REF: 14 | 27-29 TOP: 1–3

BLM: Remember

• Which of the following is NOT a goal of descriptive statistics?
• summarizing data
• displaying aspects of the collected data
• reporting numerical findings
• estimating characteristics of populations

ANS: D PTS: 1 REF: 5 TOP: 1–3

BLM: Remember

• You asked ten of your classmates about their weight. On the basis of this information, you

estimated that the average weight of all students at your school is 71.8 kilograms. What is this an example of?

• descriptive statistics
• statistical inference
• a sample
• a population

ANS: B PTS: 1 REF: 5 TOP: 1–3

BLM: Higher Order - Understand

• Which is the best type of chart for comparing two sets of qualitative data?
• a line chart
• a pie chart
• a histogram
• a bar chart

(Introduction to Probability and Statistics, 3rd Canadian Edition 3e William Mendenhall Robert Beaver Barbara Beaver) (Test Bank all Chapters) 1 / 4

ANS: D PTS: 1 REF: 20-21 TOP: 1–3

BLM: Higher Order - Understand

• What does the sum of the frequencies for all classes always equal?
• the number of classes
• the class width
• the total number of observations in the data set
• one

ANS: C PTS: 1 REF: 14 TOP: 1–3

BLM: Remember

• What are the two graphical techniques most commonly used to present qualitative data?
• bar chart and histogram
• bar chart and pie chart
• line chart and pie chart
• line chart and histogram

ANS: B PTS: 1 REF: 20-21 TOP: 1–3

BLM: Remember

• What are the characteristics of experimental units generally called?
• data sets
• descriptive statistics
• internal data
• variables

ANS: D PTS: 1 REF: 10 TOP: 1–3

BLM: Remember

• A politician who is running for office in a province with 3 million registered voters

commissions a survey. In the survey, 5500 of the 10,000 registered voters interviewed say they plan to vote for her. Which of the following is the population of interest?

• the 3 million registered voters in the province
• the 10,000 registered voters interviewed
• the 5500 voters interviewed who plan to vote for her
• the 4500 voters interviewed who plan not to vote for her

ANS: A PTS: 1 REF: 10 TOP: 1–3

BLM: Higher Order - Understand

• Which of the following terms refers to the set of all possible observations about a specified

characteristic of interest?

• a frame
• a multinomial data set
• an observational study
• a population

ANS: D PTS: 1 REF: 10 TOP: 1–3

BLM: Remember

• / 4

• What is a single observation about a specified characteristic of interest called?
• a datum
• an elementary unit
• a sample
• a univariate data set

ANS: A PTS: 1 REF: 10 TOP: 1–3

BLM: Remember

• Which of the following terms refers to a graphical presentation of data that is displayed in

order of descending magnitude?

• a line chart
• a stem-and-leaf plot
• a relative frequency histogram
• a Pareto chart

ANS: D PTS: 1 REF: 16 TOP: 1–3

BLM: Remember

• A market share of 78.5% can be represented in a pie chart by a slice having a central angle

measured in degrees. In this case, what would be the size of the central angle of the market share?

• 39.3 degrees
• 78.5 degrees
• 141.3 degrees
• 282.6 degrees

ANS: D PTS: 1 REF: 14-16 TOP: 1–3

BLM: Higher Order - Apply

• Which of the following graphics is the most important and most commonly used graphical

presentation of quantitative data?

• the bar chart
• the histogram
• the pie chart
• the dotplot

ANS: B PTS: 1 REF: 27-28 TOP: 4–5

BLM: Remember

• What is the total area of the six bars in a relative frequency histogram for which the width of

each bar is ten units?

• 6
• 10
• 16
• 60

ANS: B PTS: 1 REF: 27-29 TOP: 4–5

BLM: Higher Order - Understand

• On what does the total area of the bars in a relative frequency histogram depend? 3 / 4

• the sample size
• the number of bars
• the width of each bar
• the population size

ANS: C PTS: 1 REF: 27-29 TOP: 4–5

BLM: Higher Order - Understand

• In general, how do data distributions of incomes of employees in large firms tend to be

shaped?

• They are most often skewed to the right.
• They are most often skewed to the left.
• They are generally symmetric about the mean.
• They are generally symmetric about the median.

ANS: A PTS: 1 REF: 25 TOP: 4–5

BLM: Higher Order - Understand

• Which of the following numbers constitutes the sum of the relative frequencies found in a

relative frequency distribution for quantitative data?

• 0
• 1
• 2
• 3

ANS: B PTS: 1 REF: 27-29 TOP: 4–5

BLM: Higher Order - Understand

• Which of the following best describes the term “relative class frequency”?
• It is the number of observations that fall into a given class in a frequency

distribution.

• It is the proportion of all observations that fall into a given class in a frequency

distribution.

• It is the difference between the numerical lower and upper limits of a class of

quantitative data.

• It is the average number of observations that fall into a given class in a frequency

distribution.

ANS: B PTS: 1 REF: 14 | 27-29 TOP: 4–5

BLM: Higher Order - Understand

• Suppose you have 180 observations divided into classes. One of the classes has a data class

frequency of 36. Which of the following would be its relative class frequency?

• 0.10
• 0.18
• 0.20
• 0.36

ANS: C PTS: 1 REF: 27-29 TOP: 4–5

BLM: Higher Order - Apply

• / 4