A psychologist is investigating the correlation between the number of hours of sleep a student gets and their subsequent score on a cognitive performance test. After verifying that the data meets the assumptions for a parametric test, they select Pearson's rrr.
To locate the critical value in the statistical table, how should they determine the appropriate row?
Use the total number of participants (NNN) directly.
Calculate the degrees of freedom (dfdfdf) using df=N−1df = N - 1df=N−1.
Calculate the degrees of freedom (dfdfdf) using df=N−2df = N - 2df=N−2.
Calculate the degrees of freedom (dfdfdf) using df=(r−1)(c−1)df = (r - 1)(c - 1)df=(r−1)(c−1).
513 exam-style questions on OCR A Level Psychology Data recording, analysis and presentation. Each one has a worked solution and a mark scheme showing where the marks go.