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7.1 Planning Research

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Question 53

A school drama club has 160 members: 80 girls and 80 boys. A psychologist assigns each member a different number from 1 to 160 and uses a random number generator to draw 20 different numbers. The sample contains 12 girls and 8 boys.

a.

Calculate the percentage of the sample who are girls.

[1]
b.

A teacher says that, because the proportion of girls in the sample is not the same as in the club, the psychologist's sampling method must have been biased.

Explain why the teacher's conclusion is wrong.

[2]
Markscheme

7.1 Planning Research Questions

  1. GCSE
  2. /Psychology
  3. /7.1 Planning Research

182 exam-style questions on OCR GCSE Psychology 7.1 Planning Research, covering 7.1.1 Hypotheses, 7.1.2 Variables, 7.1.3 Experimental Designs, 7.1.4 Populations and Sampling, 7.1.5 Ethical issues, and 7.1.6 Dealing with ethical issues and BPS Code. Each one has a worked solution and a mark scheme showing where the marks go.

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