![]() ![]() I only know the two group means, and don't have the raw data and don't know their SD or SEM. It also cannot do any nonparametric tests, as these require ranking the data. Prism cannot perform an paired test, as that requires analyzing each pair. ![]() You can enter data as mean, SD (or SEM) and N, and Prism can compute an unpaired t test or the Welch t test. I know the mean, SD (or SEM) and sample size for each group. The only exception is when some of the 'groups' are really controls to prove the assay worked, and are not really part of the experimental question you are asking. You should analyze all the groups at once with one-way ANOVA, and then follow up with multiple comparison tests. ![]() If I have data from three or more groups, is it OK to compare two groups at a time with a t test? ![]()
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