The OCR large data set contains information for 348 Local Authorities in England and Wales. A student selects 25 Local Authorities and records the number of people who worked mainly at or from home in 2011.
State the population.
State the sampling units.
Explain why the recorded numbers should not be compared as though they were percentages.
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.