A simple random sample of 200 residents is invited by email to complete a survey. Only 80 residents respond, and 52 of the respondents support a new park. A researcher claims that exactly 65% of all residents support the park.
Explain two problems with the researcher's claim.
Suggest one way to reduce the effect of non-response in a future survey.
State one valid informal inference that can be made from the available data.
36 exam-style questions on CCEA A Level Maths 2.4 Statistical sampling, covering 2.4.1 Statistical sampling, 2.4.2 Statistical sampling, 2.4.3 Statistical sampling, and 2.4.4 Statistical sampling. Each one has a worked solution and a mark scheme showing where the marks go.