What is the power of each of the following studies, using a t test for dependent means (based on the .05 significance level)?
Answer by using the examples below:
Study Effect Size N Tails
(a) Small 20 One
(b) Medium 20 One
(c) Medium 30 One
(d) Medium 30 Two
(e) Large 30 Two
See attached files.
FYI: A t-test for dependent means is also called a paired t-test.
For a formula to calculate the power of a t-test, see the following:
http://www.sjsu.edu/faculty/gerstman/StatPrimer/sampsize.PDF (3rd page)
For a discussion of the things that affect power, see:
http://www.power-analysis.com/power_analysis.htm (keep clicking next for more topics)
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