Make Predictions about a population

• Survey – method for collecting information• Population – group being studied

• Sample – Randomly selected part of a population

Already in notes - vocabulary

EX1) What is the probability that a student’s favorite sport is softball?

Probability = part/whole

4 22

2 11

=

EX2) Based on a school size of 360 students, how many students should you expect to have softball as their favorite sport?

2 11

X360 = 65

EX3) The table represents the results of desserts ordered in a local restaurant in one week. Based on the results how many people should you expect to order banana pudding in a month with 620 customers?

Dessert Orders taken

Apple pie 15

Ice cream 24

Banana Pudding 12

Chocolate Cake 32

No dessert ordered 52

12 135

≈ 9%

620 X 9% ≈ 56