Paired Sample T-Test Formula . ... Since the minus sign can be ignored when comparing the two t-values, ... A t-test is a statistical test that is used to compare the means of two groups.

Assumptions for the one sample t test are as follows: The data in the variables of interest should be continuous.This means they take any numeric value, such as age in years, weight in kilograms or ...

For example, in a 2-sample t-test, N - 2 is used because there are two parameters to estimate. Applying Degrees of Freedom In statistics, degrees of freedom define the shape of the t-distribution ...