A region in the Large Data Set contains records for 2000 cars. Bruno wants a sample of 40 of these cars.
Describe how Bruno could use simple random sampling to select his sample of 40 cars.
Bruno's friend suggests instead taking the first 40 cars listed in the region. Give one reason why this method is less suitable.
244 exam-style questions on AQA A Level Maths 2.2 L: Data presentation and interpretation, covering 2.2.1 Single-variable data diagrams, 2.2.2 Scatter diagrams and correlation, 2.2.3 Central tendency, variation and standard deviation, 2.2.4 Outliers and cleaning data, and 2.2 L: Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.