Student's t-test is a method in statistics to determine the probability (p) that two populations are the same in respect to the variable that you are testing.
This is a free online statistics calculator that computes the p value for Student's t-test.
You can choose the number of tails your t-test has, and you can select a t-test for groups with equal variance,
unequal variance, or paired groups, depending on where your data came from.
Student's t-test assumes that your data are continuous and come form a normally distributed population.
If your data are not continuous, or do not come from a normally distributed population, you should consider a different statistical test.
