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
49 exam-style questions on OCR A Level Maths 2.5.7 Hypothesis test using Pearson's coefficient (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.