Question 1

Which of the following is the most appropriate graphical method to display the distribution of a single categorical variable, such as types of investment in a portfolio?

Accepted Answer

Pie chart

Question 2

A restaurant manager wants to prioritize improvements based on customer complaints. She collects data on four types of complaints and wants to focus on the most frequent issues. Which chart should she use?

Accepted Answer

Pareto diagram

Question 3

Given the following ordered array of daily high temperatures: 12, 13, 17, 21, 24, 24, 26, 27, 27, 30, 32, 35, 37, 38, 41, 43, 44, 46, 53, 58, what is the range of the data?

Accepted Answer

$$58 - 12 = 46$$

Question 4

Which of the following best describes a histogram?

Accepted Answer

A graphical representation of a frequency distribution for numerical data, with adjacent bars representing class intervals

Question 5

A frequency polygon is constructed by:

Accepted Answer

Connecting the midpoints of each class interval at their respective frequencies with straight lines

Question 6

Which of the following is a key principle of graphical excellence?

Accepted Answer

Communicating complex ideas with clarity, precision, and efficiency

Question 7

A time series plot is most useful for:

Accepted Answer

Displaying how a variable changes over time

Question 8

Which of the following formulas is used to determine the suggested number of bins $$k$$ for a histogram using Sturges’ Rule?

Accepted Answer

$$k = 1 + 3.3 \log(n)$$

Question 9

Which of the following is a potential pitfall when using a nonzero origin in a bar chart?

Accepted Answer

It can exaggerate the apparent differences between values

Question 10

A scatter plot is best used to:

Accepted Answer

Examine the relationship between two numerical variables

Question 11

Which of the following is NOT a recommended feature of an ideal graph?

Accepted Answer

Adding chartjunk to make the graph more interesting

Question 12

If you have a sample size of $$n = 128$$, what is the suggested number of bins $$k$$ for a histogram according to the provided table?

Accepted Answer

$$k = 8$$

Question 13

Which of the following best describes a right-skewed distribution?

Accepted Answer

The tail on the right side of the distribution is longer than the left

Question 14

In Excel, which sequence of actions would you use to create a histogram from raw data?

Accepted Answer

Select Tools \u003e Data Analysis \u003e Histogram

Question 15

A contingency table is used to:

Accepted Answer

Display the relationship between two or more categorical variables

Question 16

Which of the following is a limitation of dot plots and stem-and-leaf displays?

Accepted Answer

They are not effective for large data sets

Question 17

Which of the following is a deceptive practice when designing graphs?

Accepted Answer

Using a pyramid chart to display bar volumes

Question 18

A pictogram is best described as:

Accepted Answer

A visual display where data values are replaced by pictures

Question 19

Which of the following is true about cumulative frequency polygons (ogives)?

Accepted Answer

They plot cumulative frequencies or percentages against class boundaries

Question 20

If a histogram of P/E ratios is constructed with too few bins, what is the likely result?

Accepted Answer

The distribution will appear oversimplified, possibly hiding important features

Describing Data Visually in Business Statistics

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