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Question: the testretest method is one way of establishing the reliability...

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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 re-administered 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. (Give your answers correct to two decimal places.)

First Score 86 85 97 65 77 66 67 80 90 93
Second Score 79 73 60 62 80 68 87 58 56 88

(a) Find r.

(b) Set a 95% confidence interval for ρ.

Lower Limit
Upper Limit
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