Discussion
For an intelligence test, while computing item-remainder correlations for item analysis, we compute
Answer: D
In item analysis the item-remainder correlation is the correlation between a dichotomous item score (right or wrong) and the continuous score on the rest of the test, and the point-biserial coefficient is the one used for a true dichotomy and a continuous variable. The phi coefficient is for two true dichotomies, the tetrachoric is for two artificial dichotomies of normal variables, and Spearman rho is for two sets of ranks. For example, an item scored 1 or 0 is correlated with the total of all the other items, and a high value shows that the item measures what the rest of the test measures. The answer is the point-biserial correlation.
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