4/3 ~ 14.2 Notes 🕹️Practice Problems

What is a two-way frequency table used for?

• To summarize bivariate categorical data

• To calculate averages

• To display linear equations

• To solve quadratic equations

What is the total frequency for any row or column in a two-way frequency table called?

• Joint frequency

• Marginal frequency

• Relative frequency

• Cumulative frequency

What is the joint relative frequency?

• The total of all frequencies in the table

• The ratio of the joint frequency and the total number of data points

• The difference between the highest and lowest frequency

• The sum of all marginal frequencies

A survey of high school students asked participants their gender and if they play video games. The data is summarized:

68  participants were males who play video games

 60 participants were males who do not play video games

 145 participants do not play video games

There were 279 participants in the survey

Complete the joint frequency table.

a

b

c

d

e

f

g

h

i

128

68

279

134

60

85

66

151

145

Make sure you have completed the table in your notes before you answer the following questions.

• 85

• Of the students who play video games, how many were female?

• 66

• How many female students do not play video games?

• 134

•  How many students surveyed play video games?

The two-way frequency table below shows how many freshmen and sophomores are on the swimming or tennis team.

Complete the table.

a

b

c

d

4

13

18

9

What do the highlighted numbers represent?

• Joint Frequencies

• Marginal Frequencies

• Total Frequencies

• Relative Frequencies

What are the joint frequencies?

• 40, 60, 100

• 12, 18, 30

• 20,20,70,240

• 90, 260, 40, 310

What percentage of the survey takers used a gift card?

• 40%

• 60%

• 30%

• 50%

Did a higher percentage of payment other than gift card go to the store or online?

• Store

• Online

• Catalog

• Equal