How does each of the following affect the power of a planned study? (a) A larger predicted difference between the means of the populations (b) A larger population standard deviation (c) A larger sample size (d) Using a more extreme significance level (for example, 0.01 instead of 0.05) (e) Using a two-tailed test instead of a one-tailed test (a) A larger predicted difference between the means of the populations power. (b) A larger population standard deviation power. (c) A larger sample size power. (d) Using a more extreme significance level power. (e) Using a two-tailed test instead of a one-tailed test power