Figure the predicted effect size and indicate whether it is approximately small, medium, or large, for each of the following planned studies:
Predicted Mean
Change σ^2 (variance)
(a) 8 30
(b) 8 10
(c) 16 30
(d) 16 10
What is the power of each of the following studies, using a t test for dependent means (based on the .05 significance level)?
Effect Size N Tails
(a) Small 50 Two
(b) Medium 50 Two
(c) Large 50 Two
(d) Small 10 Two
(e) Small 40 Two
(f) Small 100 Two
(g) Small 100 One
About how many participants are needed for 80% power in each of the following planned studies that will use a t test for dependent means with p _ .05?
Predicted Effect Size Tails
(a) Small Two
(b) Medium One
(c) Large Two
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