Unpaired T Test Sample Size Formula. α is the significance level using a two-sided test ie. 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.
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Your cut-off for regarding the result as statistically significant. This will give the p-value for the unpaired t-test. S 2 x m A 2 x m B 2 n A n B 2.
X 1 is the mean of the first set or group of unpaired data samples.
N₂ is the second sample size. 531 Equal sample sizes and variance. 1β is the power of your test. 53 Independent two-sample t-test.
