On this page you decide which of the parametric test for differences in groups you need to use. T Tests or ANOVA?
If you have 2 groups or samples that you are comparing differences....then click here to decide which T Test is appropriate
If you have 3 Groups, or more Groups, then Follow this Link.
Sometimes you have just one group that you are testing for differences between a known population mean. In that case you use the One-Sample T Test
If what you are trying to answer doesn't fit any of the above scenarios
or if you have nonparametric data, then you have arrived at the wrong page,
either press the back button on your web browser or head back to the start page