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2.2.2 Scatter diagrams and correlation

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Question 10

For a sample of 30 cars, the regression line of CO emission $c\,$ g/km on CO $_2\,$ emission $e\,$ g/km is

$c = 0.05 + 0.0021 e$

One of the 30 cars has $e = 240$ and $c = 0.06$ . This value is checked and found to be correct. It lies well below the regression line.

State, with a reason, the effect that this one car has on the gradient of the regression line.

[2]

Explain the effect this car has on the CO emission the line predicts for a car with $e = 220$ .

[2]

State, with a reason, whether this car should be removed from the sample.

[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

Question bank

2.2.2 Scatter diagrams and correlation

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

Question 10

For a sample of 30 cars, the regression line of CO emission $c\,$ g/km on CO $_2\,$ emission $e\,$ g/km is

$c = 0.05 + 0.0021 e$

One of the 30 cars has $e = 240$ and $c = 0.06$ . This value is checked and found to be correct. It lies well below the regression line.

State, with a reason, the effect that this one car has on the gradient of the regression line.

[2]

Explain the effect this car has on the CO emission the line predicts for a car with $e = 220$ .

[2]

State, with a reason, whether this car should be removed from the sample.

[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.