a) for a small effect size, 0.20 in G'Power 3.1.9.7 X b.) for a medium effect size, 0.50 File Edit View Tests Calculator Help Central and noncentral distributions Protocol of power analyses critical t =1.64732 In G'Power 3.1.9.7 File Edit View Tests Calculator Help Central and noncentral distributions Protocol of power analyses 0.3 critical t - 1.66023 0.2- 0.3 10.2 . Test family Statistical test ttests Means: Difference between two independent means (two groups) Type of power analysis Test family Statistical test A priori Compute required sample size - given a, power, and effect size I tests Means: Difference between two in ent means (two groups) Type of power analysis Input Parameters Output Parameters A priori Compute required sample size - given a, power, and effect size Tail(s) One Noncentrality parameter & 2.4899799 Determine -> Effect size d 0.2 Critical 1.6473230 put Parameters Output Parameters 0.05 Tail(s) One 25248762 a err prob Noncentrality parameter & 618 Effect size d -6602343 Power (1-B err prob) 0.80 Determine - > Critical Sample size group I 310 0.5 310 a err prob 0.05 100 Allocation ratio N2/NI Sample size group 2 Power (1-6 err prob) 0.80 51 Total sample Allocation ratio N2/N1 Sample size group 2 Actual powe 0.8002178 0.8056966 The sample size is 620 The sample size is 102 c.) for a large effect size, 0.80 Ba G"Power 3.1.9.7 X File Edit View Tests Calculator Help Central and noncentral distributions Protocol of power analyses Question: critical t = 1.68385 1.) Out of three effect 0.3- 0.2 size (0.8, 0.2, 0.5) Which 0.1 effect size should you Test family Statistical test use? Explain Why. ttests v Means: Difference between two independent means (two groups) Type of power analysis A priori: Compute required sample size - given a, power, and effect size Input Parameters Output Parameters Tail(s) One Noncentrality parameter & 2.5922963 Determine => Effect size d Critical t 1.6838510 a err prob 0.05 Power (1-B err prob) .80 Sample size group 1 21 ocation ratio N2/NI size group 2 21 Total sample size 42 Actual power 0.8167878