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2.2.2 Scatter diagrams and correlation

2.2.2 Scatter diagrams and correlation

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Question 22

A report on 120 cars from the AQA Large Data Set states the following.

"The correlation coefficient between CO2 _2\,2​ emission and CO emission is 0.81. Cutting CO2 _2\,2​ emissions across England by 1 g/km per car would therefore cut CO emissions by 0.0025 g/km per car."

a.

State what is wrong with the step from the correlation coefficient to the conclusion about cutting emissions.

[2]
b.

The CO2 _2\,2​ emissions in the data range from 100 g/km to 245 g/km. Explain why the figure 0.0025 g/km should not be applied to a car outside this range.

[2]
c.

Using your knowledge of the Large Data Set, give two reasons why the conclusion about England is not supported.

[2]
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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