Which statistic estimates the average of all the possible split-half correlations but can only be used when each question has only two response alternatives?
A)the Spearman-Brown formula
B)the Kuder-Richardson formula 20
C)Cronbach's alpha
D)Cohen's kappa

Question

Which statistic estimates the average of all the possible split-half correlations but can only be used when each question has only two response alternatives?
A)​the Spearman-Brown formula
B)​the Kuder-Richardson formula 20
C)Cronbach's alpha
D)​Cohen's kappa

Quizplus · Accepted Answer

The Kuder-Richardson formula 20 is used to estimate the average of all possible split-half correlations, but can only be used when each question has only two response alternatives.

Which Statistic Estimates the Average of All the Possible Split-Half