The Effect Size for the Data from an Independent-Measures T

The effect size for the data from an independent-measures t test can be measured by r² which is the percentage of variance accounted for.Which of the following also produces the value for r²?

A) squaring the Spearman correlation for the same data
B) squaring the point-biserial correlation for the same data
C) squaring the Pearson correlation for the same data
D) None of the other options will produce r².

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