A gym surveys its members about opening times.
Suggest a suitable sampling frame.
Identify the sampling units.
The first 20 members entering one morning are surveyed. Name this technique.
Give one advantage and one disadvantage of this technique.
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.