Samples and Predictions

Mr. Lopez wants to know the average height of all the 7th graders in the school.
Which sampling method would give him biased results?

• Measuring the height of every 10th student on the 7th-grade roster.

• Measuring the height of 30 randomly selected 7th graders.

• Measuring the height of the players on the basketball team.

• Measuring the height of 7th graders from each homeroom chosen at random.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Ms. Turner wants to find out the average number of hours 7th graders spend on homework each week.
Which sampling method would give her unbiased results?

• Surveying only students in the advanced math class

• Surveying students who are hanging out in the library after school

• Surveying 40 students randomly selected from the entire 7th grade

• Surveying only her own homeroom class

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Which survey is least likely to contain bias?

• Surveying customers at a pizza restaurant to find out the most popular restaurant

• Surveying trumpet players of the school band to determine the most popular musical instrument

• Surveying students in the art club to find the favorite exploratory class

• Surveying a random sample of students from the entire school to determine the most popular school lunch

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Biased or Unbiased

You want to find out what the middle school's favorite lunch item is. You survey every 10th student walking into the school.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Biased or Unbiased

Coach Parker wants to find out what the best sport is so he surveys 15 kids on the wrestling team.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Biased or Unbiased

You want to find out what's the best restaurant in Thomasville. You go to Long Horn's and ask 8 random people.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Biased or Unbiased

Coach Wilson surveys 50 random people out of the phonebook and asks them about their favorite snack food.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Biased or Unbiased

To find out what the favorite radio station is, a survey of 100 random drivers was done.

• Biased

• Unbiased

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A group of people were asked about their favorite types of pants. What is the sample size of the survey?

• 25

• 40

• 50

• 60

Tags

CCSS.6.SP.B.5A

A group of people were asked about their favorite types of pants. What is the probability a person chose jeans?

• $\frac{25}{50}$

• $\frac{15}{50}$

• $\frac{10}{50}$

• $\frac{50}{50}$

Tags

CCSS.7.SP.C.7B