Which of the Following Statements Is/are Correct About Calculating the SMD

Multiple Choice

Which of the following statements is/are correct about calculating the SMD effect size with single-system data?

A) Divide the pooled standard deviation into the difference between the baseline and intervention means.
B) Divide the intervention standard deviation into the difference between the baseline and intervention means.
C) Never change the plus sign into a minus sign after the calculations are done.
D) Never change the minus sign into a plus sign after the calculations are done.