To estimate changes in test reliability that would result from changing the length of a test, one would use the
A) phi coefficient.
B) Kuder-Richardson 20.
C) Spearman-Brown.
D) coefficient alpha.

Question

Quizplus · Accepted Answer

The Spearman-Brown formula is used to estimate changes in test reliability that would result from changing the length of a test. This formula estimates the correlation coefficient between two halves of a test that were split into equal length parts. It provides an estimate of the reliability of one half of the test if the length of the test were to change. Therefore, it is the best choice for estimating changes in test reliability resulting from length changes.

To Estimate Changes in Test Reliability That Would Result from Changing