Browse Sampling

22 questions at your level

DifficultyAll Level 1 Level 2 Level 3 Level 4 Level 5

Populations & samples

11 questions

LessonNot started

A wildlife group is estimating the number of deer in a large forest.

They catch

32

deer, fit each one with a tag and release them.

Two weeks later they catch

48

12

of these deer have a tag.

(a) Work out an estimate for the number of deer in the forest.

(b) State one assumption you have made in working out your estimate.

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500

Group	Number of students
Year 12	$236$
Year 13	$153$
Adult learners	$111$

Rosa takes a stratified sample of

25

of these students.

Work out how many students from each group should be in Rosa's sample.

You must show that your three numbers add up to

25

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Bias & sampling methods

11 questions

LessonNot started

A town council wants to find out what the town's residents think about a plan to build a new car park in the town centre. A researcher stands outside the town's largest supermarket between 10 am and midday on a Wednesday and asks 100 shoppers for their views.

(a) Give two reasons why this sample may not represent the views of all the town's residents.

(b) The researcher says: "I will ask 500 shoppers instead of 100. Then the sample will represent the town." Explain why he is wrong.

(c) Describe a better method the council could use to choose its sample.

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A school council is writing a questionnaire about the new school dinners. This is one question from it.

Most students think the new school dinners are excellent. Don't you agree?

Yes
No

(a) Write down two criticisms of this question.

(b) Rewrite the question so that it is suitable for the questionnaire. You must include suitable response boxes.

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