Math 8 · Unit 6: Collecting data · Cambridge Lower Secondary Maths Stage 8

Questions

1. 1. The whole group you want information about is the …

   • sample
   • data
   • survey
   • population
   Check

2. 2. Asking only a football club about favourite sports gives …

   • the whole population
   • a biased sample
   • a fair result
   • a random sample
   Check

3. 3. In a random sample …

   • only the first people asked
   • everyone has an equal chance of being chosen
   • the tallest are chosen
   • you choose your friends
   Check

4. 4. Which sample is likely to be more reliable?

   • 200 friends
   • 200 people chosen at random
   • 5 people chosen at random
   • 10 teachers
   Check

5. 5. Picking names out of a hat is a way to get …

   • a census
   • secondary data
   • a random sample
   • a biased sample
   Check

6. 6. A survey of the whole population is called …

   • a pilot
   • a tally
   • a census
   • a sample
   Check

7. 7. Why use a sample instead of the whole population?

   • It is always more accurate.
   • It includes everyone.
   • It is quicker and cheaper.
   • It needs no planning.
   Check

8. 8. To find the average height of students in a school, asking only the basketball team is …

   • biased
   • random
   • fair
   • a census
   Check

9. 9. A school has 800 students. A 10% sample is …

   • 10 students
   • 80 students
   • 8 students
   • 800 students
   Check

10. 10. Asking people at a gym about exercise habits is likely to …

    • overestimate how much people exercise
    • be perfectly fair
    • have no effect
    • underestimate exercise
    Check

11. 11. Which is a random sample of a class?

    • students who volunteer
    • the first 5 to arrive
    • the front row
    • choosing by numbered cards drawn without looking
    Check

12. 12. Too small a sample may …

    • be a census
    • always be biased on purpose
    • give unreliable results
    • be too expensive
    Check

13. 13. A phone survey at 11 a.m. on a weekday might miss …

    • no one
    • retired people
    • children at home
    • people at work
    Check

14. 14. Is a sample of every 10th person on a list random?

    • No, it is always biased
    • Not fully, but it is systematic and often fair
    • Yes, completely random
    Check

15. 15. The main reason to choose a random sample is to …

    • avoid bias
    • get more data
    • make it harder
    • save paper
    Check