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2.5.11 Inference using a correlation coefficient (A-level only)

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Question 38

Will sells cars. He thinks there is a positive correlation between the price of a car and its mileage.

He calculates the product moment correlation coefficient between these two variables for a random sample of 15 cars and obtains $r = 0.455$

Carry out a suitable test to investigate Will's belief at a 5% level of significance.

State clearly

your hypotheses
your critical value

[3]

Markscheme

2.5.11 Inference using a correlation coefficient (A-level only) Questions

A Level
Maths
2.5.11 Inference using a correlation coefficient (A-level only)

47 exam-style questions on OCR (MEI) A Level Maths 2.5.11 Inference using a correlation coefficient (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

2.5.11 Inference using a correlation coefficient (A-level only)

Question bank

2.5.11 Inference using a correlation coefficient (A-level only)

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

Question 38

Will sells cars. He thinks there is a positive correlation between the price of a car and its mileage.

He calculates the product moment correlation coefficient between these two variables for a random sample of 15 cars and obtains $r = 0.455$

Carry out a suitable test to investigate Will's belief at a 5% level of significance.

State clearly

your hypotheses
your critical value

[3]

Markscheme

2.5.11 Inference using a correlation coefficient (A-level only) Questions

A Level
Maths
2.5.11 Inference using a correlation coefficient (A-level only)

47 exam-style questions on OCR (MEI) A Level Maths 2.5.11 Inference using a correlation coefficient (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.