Definition t-test

The t-test is a hypothesis test with which we can test an assumption about an expected value of one or several populations with unknown standard deviations.

The t-test is frequently used in regression analysis. The F-test determines if an obtained dependence is true not only for the sample, but for the population as well. The t-test, on the other hand, tests the significance of each individual variable.

If we just plan to assess the dependence of two variables in a regression analysis, doing one of the two tests will suffice. A normally distributed population is a prerequisite of the t-test. 

Please note that the definitions in our statistics encyclopedia are simplified explanations of terms. Our goal is to make the definitions accessible for a broad audience; thus it is possible that some definitions do not adhere entirely to scientific standards.