Sample and Inference

A jar contains 500 M&Ms. You select 25 M&Ms at random and 5 of those selected are green. How many green M&Ms can you expect to be in the jar? Show your work.

• 125

• 100

• 500

• 20

Why is random sampling important?

• It allows you to make generalizations about a population.

• It focuses on a specific group in a population.

• It is easier to make bias decisions about a population

• It is easy

Ms. Cassermere wants to know 7th grade students' favorite tv show. She picks 20 students to ask.

What is the population?

• All students at Commodore

• All students in 701

• The 20 students who get picked

• All students in 7th grade

Ms. Cassermere wants to know 7th grade students' favorite tv show. She picks 20 students to ask.

What is the sample?

• All students at Commodore

• All students in 701

• The 20 students who get picked

• All students in 7th grade

Ms. Cassermere wants to know 7th grade students' favorite tv show. She picks 20 students to ask.

How should Ms. Cassermere pick her sample?

• Pick 20 students, all in section 702

• Pick 20 students in Kindergarten

• Pick 20 girls

• Pick 20 students in 7th grade

The 7th graders at KRMS were randomly surveyed. They were asked if they wanted to go on a field trip or have a picnic at the end of the year. The results are shown in the table. How many of the 100 7th grade students would you expect to want to go on a field trip?

Field Trip - 20

Picnic - 5

• 20

• 80

• 25

• 75

Mr. Jackson finds that 3 out of 5 students in his sample pick Fortnite as their favorite video game.

There are 10 students in Mr. Jackson's advisory. How many total students in his advisory would you expect to like Fortnite the most?

Make an equivalent fraction to solve:  $\frac{3}{5}=\frac{?}{10}$  

• 3

• 5

• 6

• 10

Mr. Cardarella finds that 4 out of 10 students in his sample pick Takis as their favorite food.

There are 35 students in 702. How many total students in 702 would you expect to like Takis the most?

• 4

• 14

• 35

• 40

Ms. Elder finds that 15 out of 20 students in her sample pick "Fullmetal Alchemist" as their favorite Anime show.

What percentage of the students who were surveyed picked  "Fullmetal Alchemist?"

• 15

• 20

• 90

• 75

Hannah surveyed 50 of the 450 students at her school to determine ownership of cats and dogs. Her results

are shown in the table.

Pet Owned Frequency

Cat only 8

Dog only 12

Cat and dog 10

No pet 20

How many of the students in Hannah’s school would you predict own at least one cat or dog?

• 180

• 270

• 72

• 108