1. A way to organize data in TWO CATEGORIES.
Two-Way Frequency Table:
Two-way Relative Frequency Table:
Fractions  Decimals
Decimals  Percents
A survey was taken of students and what flavor of ice cream they preferred.
FILL IN the marginal frequencies (the totals of the columns and the rows).
A way to organize data in TWO CATEGORIES.
Create a Relative Frequency Table using DECIMALS.
Compares each entry to the total number of items.
DIVIDE EACH ENTRY BY THE GRAND TOTAL.
Create a Relative Frequency Table using PERCENTS.

2. 1. What percent of those surveyed preferred vanilla?
Use the two-way relative frequency table above to answer the following:
1. What percent of those surveyed preferred vanilla?
2. What percent of those surveyed preferred chocolate?
3. Of those surveyed, what percent were girls?
4. What percent of those surveyed were girls who preferred chocolate?
5. What percent of those surveyed were boys who preferred something other than chocolate or vanilla?
These are THINKERS!
Sometimes you are asked to find a percent, but
it’s not out of the grand total, it’s out of something else!
Remember: “of” is the denominator
“of” is the key word for the “total”
6. What percent of the girls preferred something other than vanilla or chocolate?
7. What percent of those who preferred chocolate were boys?
8. What percent of the boys preferred vanilla?
9. What percent of those who preferred vanilla were boys?