Discussion
In a multiple choice achievement test, item-remainder correlation can be best obtained through
Answer: A
The correlation is best obtained through point-biserial correlation.
In an item-remainder correlation each item score is dichotomous (right or wrong) and the remainder score, the total without that item, is continuous. Point-biserial correlation is the measure for one dichotomous and one continuous variable.
Phi coefficient needs two dichotomies, the contingency coefficient is for categorical frequency tables, and rank difference correlation is for two sets of ranks, so none of these suits the data.
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