Marcus wants to test to see if there is a correlation between the age of a car, in years, and its fuel efficiency, in miles per gallon.
He calculates the product moment correlation coefficient between these two variables for a random sample of 30 cars and obtains r=0.35r = 0.35r=0.35.
Carry out a suitable test to investigate Marcus's belief at a 10% 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.