Question

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	85	94	67	75	97	84	81	93	86	93
Second Score	53	52	72	72	55	84	64	55	55	85

(a) Find r.


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

Lower Limit -

Upper Limit -

Answer 1