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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 74 89 86 74 64 79 71 74 83 83
Second Score 54 75 77 87 83 61 85 84 92 56

(a) Find r.


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

Lower Limit
Upper Limit
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