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The test-retest method is one way of establishing the reliability of a test. The test is...

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 84 73 98 92 86 69 93 66 89 97
Second Score 74 92 56 57 80 90 73 65 60 81

(a) Find r.


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

Lower Limit _____
Upper Limit _____



You may need to use the appropriate table in Appendix B to answer this question.

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