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Numeracy Foundation November 2016 Unit 1 Q7

WJECFoundationCurrent spec3 marksAverages (including IQR)

7. A survey was carried out to find how often teenagers buy DVDs.

The following two questions were asked in a questionnaire.

Q1. Where do you live?

Q2. How often do you buy DVDs?

Never
☐
1-10 times
☐
10-15 times
☐
More than 15 times
☐
(a) For each question give one reason why it is not suitable. [2]

Q1.

Q2.

(b)

The survey was carried out by leaving copies of the questionnaire on the DVD shelves in a supermarket.

Give one criticism of how the survey was carried out. [1]