Eighty households are numbered 01 to 80. A researcher reads the following two-digit random numbers from left to right.
04, 81, 17, 17, 60, 00, 72, 39, 95, 2804,\ 81,\ 17,\ 17,\ 60,\ 00,\ 72,\ 39,\ 95,\ 2804, 81, 17, 17, 60, 00, 72, 39, 95, 28
Write down the labels of the six households selected for a simple random sample.
Explain why 81 and the second occurrence of 17 are not used.
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.