1.

A multiple choice test consists of 50 test items. The difficulty values of items vary in a narrow range with an average value of 0.48. The test gave a variance of 81 when administered to a ​group of students. The reliability co efficient of the test would be :

A. 0.91
B. 0.86
C. 0.78
D. 0.67
Answer» C. 0.78


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