T Score Calculator

This works out the t statistic of a t-test from summary data: one sample against a hypothesised mean, or two independent groups by either the Welch or the pooled form. You enter the means, the standard deviations and the sample sizes, and it returns t, the degrees of freedom, the standard error and the two-tailed p-value, with the formula it used written out beside them. A third mode gives the critical t value for a confidence level, including for the fractional degrees of freedom a Welch test produces, which no printed table has a row for. This is the t of a t-test, not the bone density T-score from a DEXA scan.