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
51 exam-style questions on Edexcel A Level Maths 1.3 Hypothesis Testing for Zero Correlation. Each one has a worked solution and a mark scheme showing where the marks go.