If you want to know whether one population mean is greater than or less than the other, perform a one-tailed t-test.If you only care whether the two populations are different from one another, perform a two-tailed t-test.comparing the acidity of a liquid to a neutral pH of 7), perform a one-sample t-test. If there is one group being compared against a standard value (e.g.two different species, or people from two separate cities), perform a two-sample t-test (a.k.a. If the groups come from two different populations (e.g.measuring before and after an experimental treatment), perform a paired t-test. If the groups come from a single population (e.g.One-sample, two-sample, or paired t-test?
When choosing a t-test, you will need to consider two things: whether the groups being compared come from a single population or two different populations, and whether you want to test the difference in a specific direction. If your data do not fit these assumptions, you can try a nonparametric alternative to the t-test, such as the Wilcoxon Signed-Rank test for data with unequal variances.
If you want to compare more than two groups, or if you want to do multiple pairwise comparisons, use an ANOVA test or a post-hoc test. Frequently asked questions about t-testsĪ t-test can only be used when comparing the means of two groups (a.k.a.
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