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=0.455r = 0.455r=0.455
Carry out a suitable test to investigate Will's belief at a 5% level of significance.
State clearly
47 exam-style questions on CCEA A Level Maths 4.6.5 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.