A psychologist is investigating job satisfaction among the 120 employees at a leisure centre. The psychologist plans to choose a random sample of 15 employees as follows.
Step 1: Obtain the complete staff list. Step 2: Give each employee on the list a different number from 1 to 120. Step 3: Choose the first 15 employees who arrive at work on Monday morning.
Explain why Step 3 would not give a random sample, and describe what the psychologist should do in its place.
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.