Sarah wants to determine if there is a correlation between the number of hours students spend revising and their scores on a standardized mathematics test.
She calculates the product moment correlation coefficient for a random sample of 50 students and finds r=0.25r = 0.25r=0.25.
Carry out a suitable test to investigate Sarah'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.