Talat fits a single regression line to all the cars in the AQA Large Data Set and uses it to predict the CO emission of a diesel car registered in Wales in 2010 whose CO2 _2\,2 emission is 300 g/km.
Using your knowledge of the Large Data Set, give three reasons why this prediction is not justified.
Explain how the missing CO emission values could bias any line fitted to the diesel cars in the data set.
State one thing Talat could do to investigate whether that bias is present.
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.