Devi wants to investigate whether petrol cars have higher CO emissions than diesel cars. She decides to use the AQA Large Data Set.
State the population Devi's conclusions can apply to.
Describe how Devi could obtain a sample of 60 petrol cars and 60 diesel cars from the data set.
State the two summary statistics Devi should calculate for each of her two samples in order to compare them.
After processing her results Devi finds that some CO emission values are missing. Explain why this means she may need to repeat part of the problem solving cycle.
28 exam-style questions on AQA A Level Maths 2.1 K: Statistical sampling, covering 2.1.1 Populations, samples and sampling techniques. Each one has a worked solution and a mark scheme showing where the marks go.