Kwame is studying the time it takes members of his gym to travel to the gym.
He stands by the door of the gym in the morning and asks the first 40 members as they arrive how long their journey was.
State the sampling method Kwame used.
State and briefly describe an alternative method of non-random sampling Kwame could have used to obtain a sample of 40 members.
36 exam-style questions on OCR A Level Maths 2.1 Statistical Sampling, covering 2.1.1 Population and sample, 2.1.2 Informal inferences from samples, 2.1.3 Sampling techniques, 2.1.4 Selecting or critiquing sampling techniques, and 2.1 Statistical Sampling. Each one has a worked solution and a mark scheme showing where the marks go.