The test€“retest method is one way of establishing the reliability of a test. The test is administered, and then, at a later date, the same test is readministered to the same individuals. The correlation coefficient is computed between the two sets of scores. The following test scores were obtained in a test€“retest situation.

Find r and set a 95% confidence interval for r.

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First Score 75 87 60 75 98 80 68 84 47 72 Second Sce 72 90 52 75 94 78 72 80 53 70