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 | 79 | 54 | 71 |
(a) Find r.
(b) Set a 95% confidence interval for ρ.
lower limit | |
upper limit |
solution
The correlation coefficient is computed from excel using command
=CORREL(select range of First score, Select range of Score)
(a) Find r
0.95
b)
95% CI is from 0.81 to 0.99
lower limit = 0.81
upper limit = 0.99
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. (Round your answers to two decimal places.) First Score 75 87 60 75 98 80 68 84 47 72 Second Score 71 89 51 74 93 79...
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...
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 86 85 97 65 77 66 67 80 90 93 Second Score 79 73 60 62 80...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
Use the Grouped Distribution method for the following exercise (see Self-Test 2-4 for detailed instructions), rounding each answer to the nearest whole number. Using the frequency distribution below (scores on a statistics exam taken by 80 students), determine:ion 1 of the preliminary test (scores on a statistics exam taken by 80 students), determine: 68 84 75 82 68 90 62 88 76 93 73 79 88 73 60 93 71 59 85 75 61 65 75 87 74 62 95...
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