A method for assessing the overall reliability of a test by splitting it into all possible halves is called the
A) point biserial
B) discrimination index (DI)
C) vix formula 44
D) Kuder-Richardson formula (KR21)

Question

Quizplus · Accepted Answer

The method described in the prompt is known as the Kuder-Richardson formula (KR21). It is used to estimate the internal consistency reliability of a test by splitting it into all possible halves and then comparing the scores of the two halves. This method is particularly useful for tests with multiple-choice questions, but can be applied to other types of tests as well. Option A (point biserial) is a formula used to assess the correlation between a continuous variable and a dichotomous variable. Option B (discrimination index) is a measure of how well a test item discriminates between high and low performers. Option C (vix formula 44) is not a recognized method for assessing reliability.

A Method for Assessing the Overall Reliability of a Test