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Pearson Product-Moment Correlation

The reliability coefficient is examined.

The reliability coefficient is maximized when: a) The examinees are heterogeneous b) the examiners are homogeneous c) THe examinees are very similar d) Both b abd c are correct Answers are explained below.

Correlation Analysis & Pearson

I have tried these questions with no luck (see attached file). Is there a guide that you can provide that will help me figure out what test I should be using for certain data sets? Please help! Thanks you.