Common Core 7.SP.A.1 worksheet

Question 1

A survey is planned by asking people leaving a gym how often they exercise. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 2

You want to find out how many hours of sleep teenagers get. Which sampling method is the fairest (least biased)?

• A. Use a random number generator to pick students from every year group
• B. Ask your own class only
• C. Post a poll that only night-owl gamers see
• D. Ask students in the library at 8 am

Question 3

In a random sample of 25 students, 18 said they walk to school. There are 900 students in the school. Estimate how many walk to school.

Answer 

Question 4

To check a factory's light bulbs, an inspector tests every 50th bulb made during the day. Is this sample likely to be biased?

• A. Yes, biased
• B. No, fair

Question 5

A survey is planned by asking people leaving a gym how often they exercise. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 6

You want to find out which school lunch is most popular. Which sampling method is the fairest (least biased)?

• A. Ask the kitchen staff
• B. Ask the first 10 students in the vegetarian queue
• C. Ask every 10th student on the register, across all years
• D. Ask only Year 7

Question 7

In a random sample of 25 students, 10 said they walk to school. There are 675 students in the school. Estimate how many walk to school.

Answer 

Question 8

To find the town's favourite sport, a reporter asks people leaving a tennis club. Is this sample likely to be biased?

• A. Yes, biased
• B. No, fair

Question 9

A survey is planned by asking only the members of the football team about favourite sports. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 10

You want to find out which school lunch is most popular. Which sampling method is the fairest (least biased)?

• A. Ask every 10th student on the register, across all years
• B. Ask only Year 7
• C. Ask the kitchen staff
• D. Ask the first 10 students in the vegetarian queue

Question 11

In a random sample of 25 students, 4 said they walk to school. There are 900 students in the school. Estimate how many walk to school.

Answer 

Question 12

To find students' favourite subject, a student council picks 40 names at random from the full school list. Is this sample likely to be biased?

• A. Yes, biased
• B. No, fair

Question 13

A survey is planned by asking people leaving a gym how often they exercise. Is this likely to give a fair (unbiased) sample?

• A. Yes
• B. No, it is biased

Question 14

You want to find out how people in a town travel to work. Which sampling method is the fairest (least biased)?

• A. Ask cyclists in a bike shop
• B. Ask people waiting at a bus stop
• C. Choose 100 households at random from the town's address list
• D. Ask drivers at a petrol station

Question 15

In a random sample of 50 students, 27 said they walk to school. There are 1300 students in the school. Estimate how many walk to school.

Answer 

Question 16

To check a factory's light bulbs, an inspector tests every 50th bulb made during the day. Is this sample likely to be biased?

• A. Yes, biased
• B. No, fair