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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 25

For a sample of 30 cars, the regression line of CO emission c c\,c g/km on CO2 _2\,2​ emission e e\,e g/km is

c=0.05+0.0021ec = 0.05 + 0.0021ec=0.05+0.0021e

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

a.

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

[2]
b.

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

[2]
c.

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

[2]
Markscheme

2.2 L: Data presentation and interpretation Questions

  1. A Level
  2. /Maths
  3. /2.2 L: Data presentation and interpretation

244 exam-style questions on AQA A Level Maths 2.2 L: Data presentation and interpretation, covering 2.2.1 Single-variable data diagrams, 2.2.2 Scatter diagrams and correlation, 2.2.3 Central tendency, variation and standard deviation, 2.2.4 Outliers and cleaning data, and 2.2 L: Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.

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