Table 3.

Power analysis

F tests – ANOVA: Fixed effects, omnibus, one-way
Analysis:	A priori: Compute required sample size
Input:	Effect size f	0.25
	α error probability	0.05
	Power (1-β error probability)	0.80
	Number of groups	3
Output:	Non-centrality parameter λ	9.938
	Critical F	3.054
	Numerator df	2
	Denominator df	156
	Total sample size	159
	Actual power	0.805