Question: the testretest method is one way of establishing the reliability...
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.)
(a) Find r.
(b) Set a 95% confidence interval for ρ.