A researcher has constructed an attitude scale in which each item is scored from 1 to 5 depending on the extent of agreement or disagreement.The estimate of score reliability that would be recommended for this scale is
A) Kuder-Richardson formula 20.
B) Kuder-Richardson formula 21.
C) Cronbach's coefficient alpha.
D) biserial correlation coefficient.
E) phi coefficient.

Question

Quizplus · Accepted Answer

Cronbach's coefficient alpha is the most appropriate estimate of score reliability for a scale that measures attitudes using a Likert-type response format. It measures the internal consistency of a scale by indicating the degree to which items are interrelated and contribute to a single factor. Kuder-Richardson formulas and biserial and phi coefficients are appropriate for other types of scales.

A Researcher Has Constructed an Attitude Scale in Which Each