2022-07-18

Which of the following statements about the effect size is CORRECT?
a. the effect size is bigger when the two populations overlap more.
b. The effect size is NOT affected by the differences between means.
c. Standard effect size is always positive, because it is figured using the square root.
d. The effect size is bigger when the standard deviation of population gets smaller.

Eve Good

Expert

Answer: d. The effect size is bigger when the standard deviation of population gets smaller.
Explaination: Formula for effect size is,
Effect size $=\frac{\mu {}_{1}-\mu {}_{2}}{\sigma }$
That means, standard deviation of population(sigma) is inversally proportional to effect size.The effect size is bigger when the standard deviation of population gets smaller.

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