Statistics Review

Biased or Random?

Audi wants to find out how students get to school at Menifee Elementary so she places the names of all students into a fish bowl and pulls out 50 so she can survey them.

• Biased

• Random

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Biased or Random?

Zane wants to determine the favorite candy among all 7th graders. So he asks all the people who sit in his row in Math class.

• Biased

• Random

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A coach wants to know the favorite snack purchased at the concession stand during football games. Which is the best sample for the coach’s survey?

• students getting off the bus

• teachers at the school

• the football team players

• students entering the football stands

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A hospital wants to conduct a survey to find out what patients think about the quality of medical services provided by its doctors and staff. Which of these samples would give it the best results?

• taking the opinion of the entire staff in the hospital

• taking the opinion of patients in the cardiology wing of the hospital

• taking the opinion of all the doctors who treat patients in the

  hospital

• taking the opinion of every fifth patient who is discharged from the

  hospital

Tags

CCSS.7.SP.A.1

CCSS.7.SP.A.2

A high school has 1500 students.  In a random sample of 50 students, 32 own one or more pets.  Predict the number of students at the high school who own one or more pets.

• 480
• 960
• 48
• 96

Tags

CCSS.7.RP.A.2

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Marshall asked students at his school their favorite subject. The students’ responses are in the table below.

Based on the information in the table, which statement is true?

• More than half of the students chose science or social studies.

• More students chose math than social studies

• More than 50% of the students chose language arts or science

• All students chose math

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

• Mr. Holt received responses from 160 students

• 16% of the students preferred mint flavor

• 38% of the students preferred orange or lemon flavor

• More than 35% of the students preferred chocolate or pineapple flavor.

Tags

CCSS.7.EE.B.3

CCSS.7.RP.A.2

CCSS.7.RP.A.3

CCSS.7.SP.A.1

CCSS.7.SP.A.2

Mrs. Bauer wants to find out the favorite flavor ice cream of her 7th grade students. She surveyed fifty students as they arrived to school. The results are shown in the table.

What percent of students chose chocolate as their favorite flavor?

• 12%

• 24%

• 21%

• 50%

Tags

CCSS.7.RP.A.2

CCSS.7.RP.A.3

A police officer pulls over 270 people per month. In one month of pulling people over, 18 got ticketed for texting and driving. How many people would the officer expect to ticket for texting and driving after 6 months?

• 3

• 108

• 24

• 1620

Tags

CCSS.7.EE.B.3

CCSS.7.RP.A.2

CCSS.7.RP.A.3

Lula then randomly surveys a different group of 120 people. How many of the second group surveyed would be predicted to choose Woodbrook Athletic Club?

• 24 People

• 48 People

• 60 People

• 108 People

Tags

CCSS.7.RP.A.2

CCSS.7.SP.A.1

CCSS.7.SP.A.2