1) Here is information about several versions of a planned study, each involving a single sample. Calculated the predicted effect size for each study.

	Population 2	Predicted
Study	M	SD	Population 1 M	Effect Size
a	90	2	91
b	90	1	91
c	90	2	92
d	90	2	94
e	90	2	86

2) How does each of the following affect the power of a planned study?

(a) A larger predicted difference between the means of the population

(b) A larger population standard deviation

(c) A larger Sample size

(d) Using a more extreme significance level (e.g. p < .01 instead of p < .05)

(e) Using a two-tailed test instead of a one tailed test.

3) What is meant by effect size? (Write your answer for a lay person and include a drawing)

4)What is meant by the statistical power of an experiment? (Write your answer in a manner that a person that is not skilled in statistics could understand and include a drawing)