You can use both the t statistic and the z statistic to test hypotheses about the mean of population. the test that uses the t statistic is typically referred to as a t test, while the test that uses z statistic is commonly called a z test. which of the following statements are true of the t statistic? check all that apply. if you know the population standard deviation, you should use the t statistic. the formula for the t statistic is t = (m – s) / sm the t statistic provides a relatively poor estimate of z with small sample sizes. the t statistic could be considered as an estimated z statistic.