Question 1

Which of the following best describes a dotplot?

Accepted Answer

A graph of quantitative data in which each data value is plotted as a point above a horizontal scale of values, with dots representing equal values stacked.

Question 2

What is a key feature of a stemplot (stem-and-leaf plot)?

Accepted Answer

It shows the shape of the distribution and retains the original data values.

Question 3

A time-series graph is most useful for which of the following purposes?

Accepted Answer

Revealing information about trends over time.

Question 4

Which type of graph is most appropriate for displaying the relative distribution of categorical data and making it easier to compare different categories?

Accepted Answer

Bar graph

Question 5

What distinguishes a Pareto chart from a standard bar graph?

Accepted Answer

The bars are arranged in descending order according to frequencies, drawing attention to the more important categories.

Question 6

Which of the following is a potential problem with using pictographs to represent data?

Accepted Answer

They can exaggerate differences by using two- or three-dimensional objects, distorting the true differences in the data.

Question 7

If a frequency polygon is constructed using relative frequencies instead of raw frequencies, what is it called?

Accepted Answer

Relative frequency polygon

Question 8

Which of the following best describes the main principle from Edward Tufte regarding the use of ink in graphs?

Accepted Answer

Almost all of the ink in a graph should be used for the data, not for other design elements.

Question 9

A researcher wants to compare the distribution of commute times in two cities. Which type of graph would be most appropriate?

Accepted Answer

Relative frequency polygon

Question 10

Why is it misleading to use a vertical axis that does not start at zero in a bar graph?

Accepted Answer

It exaggerates the differences between groups, creating a false impression of the data.

Question 11

Which of the following is NOT a feature of a stemplot?

Accepted Answer

It is used for categorical data.

Question 12

A pie chart is most appropriate for which type of data?

Accepted Answer

Categorical data, where the size of each slice is proportional to the frequency count for the category

Question 13

Suppose you are given a small data set with only 15 values. According to Edward Tufte, what is the best way to present this data?

Accepted Answer

Use a table instead of a graph.

Question 14

Which of the following graphs would be most appropriate for showing the trend in the number of law enforcement fatalities over several decades?

Accepted Answer

Time-series graph

Question 15

A bar graph is constructed to compare the frequency of different causes of fatal plane crashes. If the bars are arranged from tallest to shortest, what type of graph is this?

Accepted Answer

Pareto chart

Question 16

Which of the following is a common misconception when interpreting pictographs?

Accepted Answer

Assuming that the area or volume of the pictograph objects is proportional to the data values, when only the height should be considered.

Question 17

Which of the following best describes a frequency polygon?

Accepted Answer

A graph using line segments connected to points located directly above class midpoint values.

Question 18

A misleading graph uses a pictograph to show the increase in the number of telephones from one year to the next. If the side length of the telephone image is doubled, by what factor does the area increase?

Accepted Answer

$$4$$

Question 19

Which of the following is a principle for constructing effective graphs, according to Edward Tufte?

Accepted Answer

Graphs should reveal the true nature of the data and avoid distorting it.

Question 20

A researcher wants to display the original data values and the shape of the distribution for a small quantitative data set. Which graph should they use?

Accepted Answer

Stemplot

Exploring Data with Tables and Graphs: Essential Graphical Methods in Statistics

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