Use of the Spearman-Brown formula would be inappropriate to
A) estimate the effect on reliability of shortening a test.
B) determine the number of items needed in a test to obtain the desired level of reliability.
C) estimate the internal consistency of a speed test.
D) All of these

Question

Quizplus · Accepted Answer

The Spearman-Brown formula is used to estimate the internal consistency of a test or scale that has been split into two halves. It would not be appropriate for determining the number of items needed to obtain a desired level of reliability or for estimating the effect of shortening a test. These purposes require different methods, such as test-retest reliability or coefficient alpha.

Use of the Spearman-Brown Formula Would Be Inappropriate to