Davina wants to test to see if there is a correlation between the number of letters in someone's name and their salary.
She calculates the product moment correlation coefficient between these two variables for a random sample of 40 people and obtains r=−0.289r = -0.289r=−0.289
Carry out a suitable test to investigate Davina's belief at a 5% level of significance.
State clearly
178 exam-style questions on WJEC A Level Maths 4.3.1 Statistical hypothesis testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.