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2.2.2 Scatter diagrams and correlation

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Question 9

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

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

[2]

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

For $n = 18$ , 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

2.2.2 Scatter diagrams and correlation Questions

A Level
Maths
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.

2.2.2 Scatter diagrams and correlation

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2.2.2 Scatter diagrams and correlation

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Question 9

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

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

[2]

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

For $n = 18$ , 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

2.2.2 Scatter diagrams and correlation Questions

A Level
Maths
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.