If 50 students were administered a classroom test,how many would be included in each group for the purpose of calculating d,the item-discrimination index?
A) 25
B) 10
C) 13
D) 17

Question

Quizplus · Accepted Answer

To calculate the item-discrimination index, the students are divided into two groups based on their scores - high scorers and low scorers. Ideally, there should be equal numbers of students in both groups. Therefore, the best choice would be to divide the 50 students into two groups of 25 each. However, since the options do not provide this choice, the next best option would be to divide them into groups of 13 and 37 (approximately equal). Therefore, the answer is C, which is the closest option to 25 or half of 50.

If 50 Students Were Administered a Classroom Test,how Many Would