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2.2.2 Scatter diagrams and correlation

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Question 7

For the 25 petrol cars in Ellie's investigation, the fuel economies ranged from 25 mpg to 55 mpg, and the regression line of CO $_2\,$ emission $y\,$ g/km on fuel economy $x\,$ mpg was

$y = 310 - 3.4 x$

Use the regression line to estimate the CO $_2\,$ emission of a car with a fuel economy of 40 mpg.

[2]

Comment on the reliability of your estimate, giving a reason.

[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

Question bank

2.2.2 Scatter diagrams and correlation

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Question 7

For the 25 petrol cars in Ellie's investigation, the fuel economies ranged from 25 mpg to 55 mpg, and the regression line of CO $_2\,$ emission $y\,$ g/km on fuel economy $x\,$ mpg was

$y = 310 - 3.4 x$

Use the regression line to estimate the CO $_2\,$ emission of a car with a fuel economy of 40 mpg.

[2]

Comment on the reliability of your estimate, giving a reason.

[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.