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2.2.2 Scatter diagrams and correlation

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Question 24

Ellie investigates the relationship between the fuel economy $x\,$ miles per gallon and the CO $_2\,$ emission $y\,$ g/km of 25 petrol cars. She finds that the equation of the regression line of $y\,$ on $x\,$ is

$y = 310 - 3.4 x$

Describe the correlation between fuel economy and CO $_2\,$ emission.

[1]

Give an interpretation of the gradient of this regression line.

[1]

Explain why this model would not be appropriate for a fully electric car.

[1]

Markscheme

2.2.2 Scatter diagrams and correlation Questions

A Level
Maths
2.2.2 Scatter diagrams and correlation

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.

2.2.2 Scatter diagrams and correlation

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2.2.2 Scatter diagrams and correlation

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Question 24

$y = 310 - 3.4 x$

Describe the correlation between fuel economy and CO $_2\,$ emission.

[1]

Give an interpretation of the gradient of this regression line.

[1]

Explain why this model would not be appropriate for a fully electric car.

[1]

Markscheme

2.2.2 Scatter diagrams and correlation Questions

A Level
Maths
2.2.2 Scatter diagrams and correlation

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.