The t-test calculation uses three data: the difference between the mean values from each data set, the standard deviation of each group, and the number of data values.

This web calculator conducts a pooled-variance t-test for a difference between two populations' means when standard deviations are unknown and equal. The calculator includes a video definition, an ...

Calculator for t-test for one population mean: t-Test for One Population Mean Calculator This web calculator allows users to specify a hypothesized mean, sample mean, sample standard deviation and ...

Wisconsin bases its calculation of COVID-19 test positivity on the number of people tested, not the raw number of tests. State officials say this was done so people who are tested repeatedly ...