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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 141

Cara wants to find the mean CO emission of the diesel cars in one region of the Large Data Set. When she opens the data she finds that the CO emission is missing for some of the diesel cars.

a.

State what Cara should do with the records for which the CO emission is missing, and state the value of n n\,n she should then divide by.

[2]
b.

Explain why Cara's mean may still not be a reliable estimate of the mean CO emission of all diesel cars in that region.

[1]
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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