A wildlife group estimates the proportion of trees in a woodland that show signs of disease. Volunteers inspect the 50 trees nearest to the car park. Twelve of these trees show signs of disease.
Use the sample to estimate the proportion of all trees in the woodland that show signs of disease.
Explain why this estimate may be unreliable.
Suggest a more suitable sampling method.
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.