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2.2.2 Scatter diagrams and correlation

2.2.2 Scatter diagrams and correlation

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Question 74

Sam uses the AQA Large Data Set to fit a single regression line to all the cars in it. He obtains

c=0.01+0.0025ec = 0.01 + 0.0025ec=0.01+0.0025e

where c c\,c is the CO emission in g/km and e e\,e is the CO2 _2\,2​ emission in g/km.

a.

Use Sam's line to estimate the CO emission of a car whose CO2 _2\,2​ emission is 200 g/km.

[1]
b.

Explain, using your knowledge of the Large Data Set, why your answer to part (a) cannot be correct for a diesel car.

[2]
c.

State the feature of the data that makes fitting a single line to all the cars inappropriate.

[1]
d.

Give one reason why Sam's line should not be used for cars in Scotland.

[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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