# Question: the testretest method is one way of establishing the reliability...

###### Question details

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 | 74 | 89 | 86 | 74 | 64 | 79 | 71 | 74 | 83 | 83 |

Second Score | 54 | 75 | 77 | 87 | 83 | 61 | 85 | 84 | 92 | 56 |

(a) Find *r*.

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

Lower Limit | |

Upper Limit |