If item analysis data showed that an item was answered correctly by 8 out of 10 students in the upper group and 6 out of 10 students in the lower group, the difficulty of the test item is
A)20%.
B)60%.
C)70%.
D)80%.

Question

Quizplus · Accepted Answer

The difficulty of a test item is calculated by the proportion of students who answered it correctly. Here, 14 out of 20 students (8 from the upper group and 6 from the lower group) answered correctly, so the difficulty is 70%.

If Item Analysis Data Showed That an Item Was Answered