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Performs unpaired t test, Weldh's t test (doesn't assume equal variances) and paired t test. Calculates exact P value and 95% confidence interval.

https://www.graphpad.com/quickcalcs/ttest1/

Click Analyze and then choose nested t test from the list of Grouped analyses. On the first tab, enter the names of the two factors.

https://www.graphpad.com/guides/prism/latest/statistics/

A t test is a statistical technique used to quantify the difference between the mean (average value) of a variable from up to two samples (datasets).

https://www.graphpad.com/guides/

The t test investigates the likelihood that the difference between the means of the two groups could have been caused by chance.

https://www.graphpad.com/guides/prism/latest/statistics/

The paired t test analyzes the differences between pairs. For each pair, it calculates the difference. Then it calculates the average difference, the 95% CI of ...

https://www.graphpad.com/guides/prism/latest/statistics/

The unpaired t test compares the means of two unmatched groups, assuming that the values follow a Gaussian distribution. Read elsewhere to learn about ...

https://www.graphpad.com/guides/prism/latest/statistics/

This page shows the test performed for each row. The P value for each comparison is shown, along with the multiplicity adjusted P value, which is higher.

https://www.graphpad.com/guides/prism/latest/statistics/

The unpaired lognormal t test compares the geometric means of two unmatched groups, assuming that the values are sampled from lognormal distributions.

https://www.graphpad.com/guides/prism/latest/statistics/

The nested t test compares the means of two unmatched groups, where there is a nested factor within those treatment groups.

https://www.graphpad.com/guides/prism/latest/statistics/

Prism offers seven related tests that compare two groups. To choose among these tests, answer three questions in the Experimental Design tab of the t test ...

https://www.graphpad.com/guides/prism/latest/statistics/