Which statistic is appropriate for use to estimate the heterogeneity of a test composed of multiple-choice items?
A) point-biserial correlation coefficient
B) Pearson-product moment correlation coefficient
C) coefficient alpha
D) chi square

Question

Quizplus · Accepted Answer

Coefficient alpha, also known as Cronbach's alpha, is a reliability coefficient often used to estimate the internal consistency of a test composed of multiple-choice items. It measures how well the items in the test are related to each other and provides an estimate of the degree of heterogeneity in the test. The other options (A, B, and D) are not appropriate for this purpose. The point-biserial correlation coefficient is used to assess the relationship between a dichotomous variable and a continuous variable. The Pearson-product moment correlation coefficient is used to assess the strength and direction of the linear relationship between two continuous variables. The chi-square test is used to analyze categorical data and test for associations between two or more variables.

Which Statistic Is Appropriate for Use to Estimate the Heterogeneity