The scatter diagram below shows the CO2 _2\,2 emission and the CO emission, both in g/km, of 56 cars from the AQA Large Data Set.
State what the diagram shows about the population of cars represented.
State which variable in the Large Data Set the two groups correspond to.
State which of the two groups contains the diesel cars, and give a reason for your answer.
157 exam-style questions on AQA A Level Maths 2.2.2 Scatter diagrams and correlation. Each one has a worked solution and a mark scheme showing where the marks go.