Dr. Dread is developing a measure of aggression that uses Likert scales. She wants to determine the instrument's internal consistency. Which statistic should be used?
A) Spearman-Brown formula
B) Kuder-Richardson 20
C) Cronbach's alpha
D) Standard error of measurement

Question

Quizplus · Accepted Answer

Cronbach's alpha is the most appropriate statistic for measuring internal consistency of Likert scales. The Spearman-Brown formula is used to estimate the reliability of scores if test length were changed. The Kuder-Richardson 20 is a measure of internal consistency for dichotomous items, not for Likert scales. The standard error of measurement is a measure of the precision of individual scores, not of internal consistency.

Dr Dread Is Developing a Measure of Aggression That Uses