6.2 Taking a sample

Which of these is a good sample size?

• 50
• 10
• 100
• At least 30

A sample is taken to conduct a survey of a group of people.

Which of these statements is correct?

• Everyone in the group completes the survey.

• More than half of the group complete the survey.

• Some of the group complete the survey.

• A sample should only include the loudest individuals.

An investigation is conducted into the use of public transport by people who live in a city.

What is the population in this investigation?

• The people who use public transport.

• The people who live in the city.

• The people who live in the whole country.

Is the following statement true or false?

When investigating a prediction, the whole population should never be used.

• true
• False.

A school has 1500 learners. To collect data from the learners, should you ask the whole population or collect a sample?

• Ask the whole population

• Collect a sample.

There are 12 bags of apples in a box. You want to record the number of apples in each bag. Should you take a sample of the bags or count all the bags?

• Take a sample.

• Count all the bags.

There are 12 000 houses in a town. A survey is to be conducted.

Should every house be asked, or should a sample be taken?

• Take a sample.

• Ask every house.

Salman wants to find out if baseball should be introduced as a new sport in his school.

Which method could he use to collect the data?

Select all appropriate methods.

• Interview a sample of learners.

• Complete an experiment.

• Observe learners at break time.

• Create a questionnaire for learners to complete.

You want to compare the results from a survey in your school by comparing boys' answers to girls' answers.

There are 420 boys in the school and 380 girls.

Which of these statements is true?

• You should ask the same number of boys and girls.

• Every student must complete the survey.

• You should ask 42 boys and 38 girls.

To conduct an experiment to record how fast someone in an athletics club can run 100 m, you take a sample of 25 people in the club.

How many people are there likely to be in the athletics club?

• 25

• 1. 50

• 250

• 1000