Sample Size for Comparison of Means

Sample Size -- Means

Instructions: Enter parameters in the Red cells. Answer will appear in the blue cells.

Q1 = proportion of subject in group 1
E = Effect Size
S = Standard Deviation in the population

Alpha (Two-tailed)	Beta	Q2	E/S
		1	0.5
Z-Alpha	Z-Beta
0.00	0.00
A =	0.00
B =	0.00
C =	0.00
AB/C =	0.00
N1	0
N2	0
Total	0

Because the formula used here is based on approximating the t statistic with a z statistic, it will slightly underestimate the sample size when N is less than about 30.

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Software utilities by Michael Kohn (mkohn@mkanders.com) and Mike Jarrett (mike.jarrett@quesgen.com)

Disclaimer: Software is provided on an as-is basis and no warrany is made of any kind. Calculations are believed accurate but should be verified by the user

Sample Size for Comparison of Means