The Spearman-Brown formula is for which purpose?
A) To make adjustments due to concerns that examinees might look up answers between taking the same test twice
B) To make adjustments to reliability estimate due to concerns of shortness of the test (limited test items)
C) To adjust correlations during factor analysis to assure accurate representation of all items
D) To calculate the coefficient of determination (shared variance) when making adjustments to reliability estimates

Question

Quizplus · Accepted Answer

The Spearman-Brown formula is used to estimate the reliability of a lengthened test by adjusting the reliability of the original test. This is necessary because as the test length increases, the reliability of the test also increases. The formula is specifically used to make adjustments to reliability estimates due to concerns of shortness of the test (limited test items).

The Spearman-Brown Formula Is for Which Purpose