Question

If 20 of 40 in the upper group and 20 of 40 in the lower group choose the correct answer to a multiple-choice question with five possible responses, what would the index of discrimination be for the item

Answer 1

When 20 of 40 in the upper group and 20 of 40 in the lower group choose the correct answer the index of discrimination will be 0.

How would you know the discrimination level of a test item?

The Discrimination Index (D) is can be found or gotten from the aspect of the equal-sized high and low scores of a given group that are found on the test.

Conclusively one can be able to do this by Subtracting the number of successes of the the small group on the item from that of the  number of successes by the biggest group, and later on one has to divide this difference by the known or given size of the group. Since the two groups are 20 of 40, then the index will be 0.

See options below

a. .50

b. .20

c. .0

d. -.20

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