A researcher investigated the relationship between SAT scores and college grades by randomly selecting fifty students from five colleges that have high SAT scores as one of their selection criteria. The results showed little relationship between SAT scores and college grades. Which of the following is a reason why the researcher may have failed to show a relationship?

a) A homogeneous group of participants was selected for the study.
b) His sample consisted of students who were randomly sampled.
c) The SAT is not a reliable test.
d) There is no relationship between SAT scores and college grades.


a

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