T-test, also known as student T-test, is mainly used for small sample size (such as N

T test is to test the significance of each regression coefficient. (-This is too incomplete. This means that in multivariate regression analysis, when testing whether the regression coefficient is 0, firstly, F test is used to consider the regression coefficient of the whole population, and then T test is used to test whether each coefficient is 0. T-test can also be used to test that the sample is the expectation from the population of univariate normal distribution, that is, the mean; I hope it helps you.