A gym surveys the first 30 members who arrive between 07:00 and 08:00 on Monday about proposed weekend opening hours.
Identify the sampling technique.
Give two reasons why the sample may be biased.
Suggest a sampling frame and a random method that would improve the survey.
36 exam-style questions on OCR (MEI) A Level Maths 2.1 Sampling, covering 2.1.1 Population and sample, 2.1.2 Samples to make informal inferences, 2.1.3 Random sampling, 2.1.4 Variety of sampling techniques, 2.1.5 Select or evaluate sampling techniques, and 2.1 Sampling. Each one has a worked solution and a mark scheme showing where the marks go.