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CPS 2126 Dr. Rajkumari Sanatombi Devi et.al
items were having zero discriminating power between the high achieving
group and low achiever group. It was also observed that 2 items were having
negative values which indicate the low performing students got a specific item
correct more often than the high scorers. The reasons of having the negative
values may be due to the mis-keyed in test items. Hence, these 4 items need
to be discarded in the construction test items. It was also clear that there was
a strong and significant positive correlation between the difficulty and
discriminating indices of the test items. The difficulty and discrimination
indices are often reciprocally related is not coming true in this study.

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