In: Statistics and Probability
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. (Round your answers to two decimal places.)
First Score | 75 | 87 | 60 | 75 | 98 | 80 | 68 | 84 | 47 | 72 |
Second Score | 73 | 91 | 53 | 76 | 95 | 77 | 71 | 81 | 54 | 69 |
(a) Find r.
(b) Set a 95% confidence interval for ρ.
lower limit | |
upper limit |