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2.2 L: Data presentation and interpretation

2.2 L: Data presentation and interpretation

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Question 15

Nadia is investigating whether there is a correlation between the age of a second-hand car, in years, and its market value, in pounds.

a.

Suggest a suitable null hypothesis and a suitable alternative hypothesis for a two-tailed test.

[2]
b.

Nadia takes a random sample of 18 second-hand cars and obtains a product moment correlation coefficient of -0.45.

For n=18n = 18n=18, the critical value for a two-tailed test at the 5% level for the population correlation coefficient is 0.4683.

Carry out the hypothesis test at the 5% significance level.

[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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