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2.2.2 Scatter diagrams and correlation

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Question 58

For a sample of 200 cars there is positive correlation between a car's age, in years, and its CO emission. A student concludes that a car's engine produces more CO as the car gets older.

Suggest a third factor that could be responsible for the correlation.

[1]

Explain how that factor could produce the correlation even if a car's age had no effect at all on its CO emission.

[2]

Describe how the student could investigate the effect of age alone.

[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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Question 58

For a sample of 200 cars there is positive correlation between a car's age, in years, and its CO emission. A student concludes that a car's engine produces more CO as the car gets older.

Suggest a third factor that could be responsible for the correlation.

[1]

Explain how that factor could produce the correlation even if a car's age had no effect at all on its CO emission.

[2]

Describe how the student could investigate the effect of age alone.

[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.