A history instructor has given the same pretest and the same final examination each semester for several years. He is interested in determining if there is a relationship between the scores of the two tests.
a. He computes the linear correlation coefficient and notes that r = 1.14. What does this correlation coefficient value tell the instructor?
b. A Mathematics instructor is also curious and conducts the same research using pretest and final results. In the case the instructor obtained an r = .82 What does this tell the instructor?