Question
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 | 87 | 95 | 70 | 72 | 77 | 93 | 88 | 82 | 86 | 73 |
| Second Score | 67 | 74 | 87 | 57 | 78 | 72 | 74 | 88 | 86 | 90 |
(a) Find r.
(b) Set a 95% confidence interval for ρ.
| Lower Limit | |
| Upper Limit |
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The test-retest method is one way of establishing the reliability of a test. The test is...
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