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4.3.1 Statistical hypothesis testing (A-level only)

4.3.1 Statistical hypothesis testing (A-level only)

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Question 146

A council records the age x x\,x years and annual repair cost y y\,y pounds for a self-contained random sample of 40 buses. The regression line of y y\,y on x x\,x is y=315x+740y=315x+740y=315x+740. One bus is 8 years old and has an annual repair cost of £3900.

a.

Find the predicted repair cost for this bus.

[2]
b.

Find its residual.

[2]
c.

Explain why the regression line alone cannot establish that age causes higher repair costs.

[1]
Markscheme

4.3.1 Statistical hypothesis testing (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.3.1 Statistical hypothesis testing (A-level only)

178 exam-style questions on WJEC A Level Maths 4.3.1 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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