Q: Given the Titanic contingency table, what percentage of First Class passengers survived?

$$\frac{201}{324} \times 100 \approx 62.0\%$$

Q: In the Super Bowl poll, what is the conditional distribution of 'Game' responses among males?

$$\frac{277}{492} \times 100 \approx 56.3\%$$

Q: Given the NYC ride market share table, what is the market share percentage for Lyft?

$$\frac{871,980}{19,973,186} \times 100 \approx 4.60\%$$

Question 1

Which of the following best describes the Area Principle in data visualization?

Accepted Answer

The area occupied by a part of the graph should correspond to the magnitude of the value it represents.

Question 2

A frequency table is used to summarize which type of variable?

Accepted Answer

Categorical variable

Question 3

Given the following frequency table for Super Bowl poll responses: Commercials (8), Game (18), Won't Watch (12), No Answer/Don't Know (2), what is the relative frequency for 'Game'?

Accepted Answer

$$\frac{18}{40} = 0.45$$

Question 4

Which of the following is NOT a requirement before making a bar chart or pie chart for categorical data?

Accepted Answer

The categories must overlap.

Question 5

A contingency table is used to:

Accepted Answer

Show how two categorical variables are related.

Question 6

In a contingency table, what is a marginal distribution?

Accepted Answer

The total count that occurs when the value of one variable is held constant.

Question 7

If the distribution of one variable is the same for all categories of another variable in a contingency table, what can be concluded?

Accepted Answer

The variables are independent.

Question 8

Which type of chart best visualizes the conditional distribution of survival by ticket class for Titanic passengers?

Accepted Answer

Segmented bar chart

Question 9

Given the Titanic contingency table, what percentage of First Class passengers survived?

Accepted Answer

$$\frac{201}{324} 	imes 100 \approx 62.0\%$$

Question 10

Which of the following statements about pie charts is TRUE?

Accepted Answer

Pie charts show the whole group as a circle sliced into pieces proportional to the fraction of the whole in each category.

Question 11

A segmented bar chart differs from a mosaic plot in that:

Accepted Answer

A mosaic plot makes the bars proportional to the sizes of the groups, obeying the area principle better.

Question 12

In the Super Bowl poll, what is the conditional distribution of 'Game' responses among males?

Accepted Answer

$$\frac{277}{492} 	imes 100 \approx 56.3\%$$

Question 13

Which of the following is a key reason to visualize data before analysis?

Accepted Answer

Visualizing data can reveal patterns and features not easily seen in tables of numbers.

Question 14

If a bar chart is constructed using percentages instead of counts, what is it called?

Accepted Answer

Relative frequency bar chart

Question 15

Which of the following best describes a conditional distribution?

Accepted Answer

The distribution for just those cases that satisfy a specified condition.

Question 16

Given the NYC ride market share table, what is the market share percentage for Lyft?

Accepted Answer

$$\frac{871,980}{19,973,186} 	imes 100 \approx 4.60\%$$

Question 17

Which visualization would best show the proportion of each ride company in NYC relative to the total market?

Accepted Answer

Pie chart

Question 18

In the Titanic contingency table, which class had the lowest survival rate?

Accepted Answer

Crew

Question 19

If you want to compare the distribution of responses between men and women in the Super Bowl poll, which chart would be most appropriate?

Accepted Answer

Side-by-side bar chart

Visualizing and Describing Categorical Data: Business Statistics Study Guide

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