
$1.99

Difference Between Means Statistics
The mean difference is a measure of statistical dispersion between to means of two independent samples.
This app tests the hypothesis that the means, μ, of two samples are equal at some level
of probability, p. The relevant statistic is the Student's ttest for the appropriate
probability and degrees of freedom, df.
The critical value of the ttest for 5% probability at 30 degrees of freedom is shown as t(0.05, 30).
There are three assumptions imbedded in this test. First, the samples must be randomly generated.
Second, the samples must be independently sampled meaning that the inclusion of one subject does
not influence the probability of selecting any other member of the population. Third, the population
variances, or standard deviations as input into this app, of the two samples, A and B, are presumed to be equal.
