A council wants to investigate the condition of 12 000 street lights. An inspector examines 100 lights on roads close to the council depot during one afternoon.
Identify the sampling technique used.
Give two reasons why the sample may be unrepresentative.
Describe how a systematic sample of 200 street lights could be selected from a numbered list of all 12 000 lights.
36 exam-style questions on WJEC A Level Maths 2.1 Statistical Sampling, covering 2.1.1 Statistical Sampling, 2.1.2 Statistical Sampling, 2.1.3 Statistical Sampling, 2.1.4 Statistical Sampling, and 2.1 Statistical Sampling. Each one has a worked solution and a mark scheme showing where the marks go.