If you wanted to compute the correlation between one nominal-level variable and one interval-level variable,which type of correlation should you use?
A)point biserial
B)phi
C)Spearman rank
D)Pearson

Question

Quizplus · Accepted Answer

Point biserial correlation is used when one variable is nominal and the other variable is interval. It measures the degree of association between a dichotomous variable and a continuous variable. Phi correlation is also used for nominal variables, but it requires both variables to have two or more categories. Spearman rank and Pearson correlations are used for interval or ratio level variables only.

If You Wanted to Compute the Correlation Between One Nominal-Level