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2.2.2 Scatter diagrams and correlation

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Question 5

For a sample of 50 petrol cars, the fuel economy $x\,$ miles per gallon and the CO $_2\,$ emission $y\,$ g/km are recorded. The fuel economies range from 22 mpg to 58 mpg, the correlation coefficient is -0.93 and the regression line of $y\,$ on $x\,$ is

$y = 318 - 3.6 x$

Interpret the value -0.93 in this context.

[2]

Find the set of values of $x$ , within the range of the data, for which the line predicts a CO $_2\,$ emission of less than 150 g/km.

[3]

The line predicts $y = 0$ when $x = 88.3$ . Explain what this shows about using the line outside the range of the data.

[2]

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 5

$y = 318 - 3.6 x$

Interpret the value -0.93 in this context.

[2]

Find the set of values of $x$ , within the range of the data, for which the line predicts a CO $_2\,$ emission of less than 150 g/km.

[3]

The line predicts $y = 0$ when $x = 88.3$ . Explain what this shows about using the line outside the range of the data.

[2]

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.