tTests & Procedures
For nonparametric alternatives to the independent and correlated samples ttests, see the MannWhitney Test and the Wilcoxon SignedRanks Test under Ordinal Data. For small samples, see also 'Resampling Probability Estimates ...' under Miscellanea.

Single Sample tTest. For the significance of the difference between the observed mean of a sample and a hypothetical mean of the population from which the sample is randomly drawn.
.95 and .99 Confidence Intervals for the Estimated Mean of a Population. Given a sample of N values of X, randomly drawn from a normally distributed population, this unit will calculate the .95 and .99 CIs for the estimated mean of the population.