$$360\times0.255=91.8$$^{\circ}$$

Calculate the central angle for each category using $$360\times ($$relative frequency).

Question 1

Which of the following is TRUE about stem-and-leaf plots?

Accepted Answer

They provide an easy way to sort small sets of quantitative data from smallest to largest.

Question 2

In a stem-and-leaf plot, what is the 'leaf' of the number 124?

Accepted Answer

4

Question 3

Which type of graph is most appropriate for displaying the frequency of different categories in qualitative data?

Accepted Answer

Bar graph

Question 4

A Pareto chart is a special type of bar graph. What distinguishes it from a regular bar graph?

Accepted Answer

Bars are arranged in descending order of frequency.

Question 5

Given the following data set: 21, 25, 25, 26, 27, 28, 30, 36, 36, 45. How many leaves would be in the stem '2' in a stem-and-leaf plot?

Accepted Answer

5

Question 6

Which of the following statements about pie charts is correct?

Accepted Answer

The area of each sector is proportional to the frequency of each category.

Question 7

If a category in a pie chart has a relative frequency of $$0.255$$, what is the central angle for this category?

Accepted Answer

$$360	imes0.255=91.8$$^{\circ}$$

Question 8

Which graph would be most appropriate to compare the number of deaths from different causes in the United States in 2019?

Accepted Answer

Pareto chart

Question 9

What is a key difference between a bar graph and a Pareto chart?

Accepted Answer

Bar graphs can have bars in any order, while Pareto charts require bars in descending order.

Question 10

A dot plot is best used for which type of data?

Accepted Answer

Small sets of quantitative data

Question 11

Which of the following is NOT a feature of a stem-and-leaf plot?

Accepted Answer

It is practical for large data sets.

Question 12

If you want to display the percentage of students earning different types of degrees in a single year, which graph should you use?

Accepted Answer

Pie chart

Question 13

Which axis typically represents the categories in a bar graph?

Accepted Answer

x-axis

Question 14

In a stem-and-leaf plot, what is the stem for the number 47?

Accepted Answer

4

Question 15

Which of the following is a correct interpretation of a Pareto chart showing causes of death?

Accepted Answer

The tallest bar represents the most common cause.

Question 16

A student wants to compare the frequency of four different favorite ice cream flavors among classmates. Which graph should they use?

Accepted Answer

Bar graph

Question 17

Which of the following is a step in constructing a pie chart from categorical data?

Accepted Answer

Calculate the central angle for each category using $$360	imes ($$relative frequency).

Question 18

Why is a stem-and-leaf plot considered impractical for large data sets?

Accepted Answer

It becomes cluttered and hard to read.

Question 19

Which of the following graphs would best display the distribution of the number of text messages sent by 50 cell phone users in one day?

Accepted Answer

Stem-and-leaf plot

Question 20

What is the main purpose of a bar graph?

Accepted Answer

To compare different categories.

Descriptive Statistics: Graphical Methods for Quantitative and Qualitative Data

Study Guide - Practice Questions