Which of the following is/are true statement(s) about the power of a study? Select all that apply.Note: Wrong selection results in points deduction on this question. Please choose wisely O

a.Given an effect size, increasing the sample size increases power O b. Given an effect size, increasing alpha cutoff increases power c. Power is invariant to the magnitude of effect size for a given alpha cutoff and sample size O d. Given an effect size, increasing the variability of samples increases power