Understanding Two-Way Frequency Tables

This video tutorial covers eighth-grade lesson 15.2 on two-way relative frequency tables. It builds on lesson 15.1 by introducing more vocabulary and concepts related to frequency tables. The lesson explains how to convert survey data into relative frequency tables using decimals and percentages. It also demonstrates creating two-way frequency tables by incorporating gender data and calculating joint and marginal relative frequencies. The tutorial concludes with a review of calculations and a farewell message to students.

What is the primary focus of lesson 15.2 in eighth grade?

• Understanding algebraic expressions

• Learning about two-way relative frequency tables

• Studying historical events

• Exploring geometric shapes

How do you convert a frequency table to a relative frequency table?

• By adding all the values together

• By dividing each frequency by the total and converting to decimals or percentages

• By multiplying each frequency by 100

• By subtracting the smallest value from each frequency

In Maria's survey, what percentage of students preferred dogs?

• 30%

• 50%

• 26%

• 44%

What additional category is introduced in a two-way frequency table?

• Gender

• Favorite color

• Age group

• Hobbies

How many boys preferred cats in Maria's survey?

• 6

• 10

• 9

• 12

What is a joint relative frequency?

• A frequency not in a total row divided by the grand total

• A frequency divided by the total of its row or column

• The sum of all frequencies in a table

• A frequency multiplied by 100

What is a marginal relative frequency?

• A frequency in a total row or column divided by the grand total

• A frequency divided by the grand total

• The difference between two frequencies

• A frequency added to the grand total

What percentage of the class are boys according to the marginal relative frequency?

• 56%

• 44%

• 30%

• 26%

How can two-way relative frequency tables be used effectively?

• To measure the area of geometric shapes

• To list historical events in order

• To compare two categories of data using percentages

• To solve algebraic equations

What is the final message from the teacher in the lesson?

• Good luck with your science projects

• Make sure to study history

• Best of luck in ninth grade algebra

• Remember to practice your art skills