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2.2.2 Scatter diagrams and correlation

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Question 13

For a random sample of 30 cars, the correlation coefficient between a car's CO emission and its CO2 _2\,2​ emission is 0.58.

For n=30n = 30n=30, the critical value for a one-tailed test at the 5% level for the population correlation coefficient is 0.3061.

a.

State what a correlation coefficient of 0.58 tells you about the points on a scatter diagram of these data.

[1]
b.

Compare 0.58 with the critical value and state what this suggests about the population.

[2]
c.

Explain why this result does not show that a car's CO2 _2\,2​ emission causes its CO emission.

[1]
Markscheme

2.2.2 Scatter diagrams and correlation Questions

  1. A Level
  2. /Maths
  3. /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.

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