Two-Way Tables, Marginal Frequency

Joint & Marginal Frequencies

Today I am going to use two-way tables

I know I've got it if I can construct and read two-way tables

Take this survey

https://forms.gle/BnRMQ3jx7GcnwAGw9

Joint Frequencies

The numbers 12, 22, 37, 29 in the example to the right are joint frequencies

Marginal Frequencies

The totals in the example to the right are marginal frequencies

Finding marginal frequencies

Find and interpret the marginal frequencies

Finding and Interprepting Marginal Frequencies

Finding and Interprepting Marginal Frequencies-Student Try

Fill in the Blanks

How many people have unlimited texts and limited minutes?

Fill in the Blanks

How many people have unlimited texts and unlimited minutes?

Multiple Choice

How many total people were surveyed?

• 175

• 253

• 268

• 15

Creating a two-way table with joint and marginal frequencies

Using the main categories of: Riding the bus and age ranges

Create a two way table complete with joint and marginal frequencies

Student try: Use categories of Student council and students

Fill in the Blanks

Give the marginal frequency for the number of students that joined student council.

Fill in the Blanks

Give the marginal frequency of the number of students that didn't join student council.

Multiple Choice

What is the marginal frequency for the number of 6th graders?

• 21

• 27

• 22

Multiple Choice

What is the marginal frequency for the total number of students surveyed?

• 140

• 70

• 27

Finding percentages of joint frequencies

Use previous table to find the percentages

Finding Marginal and Joint Frequencies

Student Try

Poll

Exit ticket Poll: Check which answer you agree with

• I can find ALL joint and marginal frequencies

• I can find MOST joint and marginal frequencies

• I can find SOME joint and marginal frequencies

• I don't think I can find any joint or marginal frequencies