When comparing two means using a ttest the effect size is eq

When comparing two means using a t-test, the effect size is equal to...

the square root of the t value

the p value

the square of the t value

the correlation of group membership with the dependent measure

Solution

The effect size can be measured using the SQUARE OF THE T VALUE, as it is always positive and grows bigger as the difference between means grow bigger. [OPTION C, SQUARE OF THE T VALUE]