Table 1.

Simulation Margins of Error for Each Sample Size

Sample Size Per Group	Number of Simulations	SE for a 5% Observed Power Result	SE for a 50% Observed Power Result	SE for an 80% Observed Power Result	SE for a 90% Observed Power Result
50	10,000	0.002	0.005	0.004	0.003
100	5000	0.003	0.007	0.006	0.004
150	5000	0.003	0.007	0.006	0.004
200	5000	0.003	0.007	0.006	0.004
300	3000	0.004	0.009	0.007	0.005
500	2000	0.005	0.011	0.009	0.007
1000	1000	0.007	0.016	0.013	0.009

SE = standard error.