Clara is investigating whether there is a correlation between the age of a second-hand car and its market value.
Suggest a suitable null and alternative hypothesis for a two-tail test.
Clara takes a sample of 18 cars and finds a product moment correlation coefficient of -0.45.
Carry out the hypothesis test at the 5% significance level.
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.