Dr. Dread has collected data on aggression using a measure with true/false items. 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) Either b or c

Question

Quizplus · Accepted Answer

For a measure with dichotomous (true/false) items, the Kuder-Richardson Formula 20 (KR-20) is appropriate for assessing internal consistency. However, Cronbach's alpha is a more general measure of internal consistency that can be used for scales with dichotomous or continuous items, making both B and C correct options for assessing the internal consistency of Dr. Dread's aggression measure.

Dr Dread Has Collected Data on Aggression Using a Measure