Question 16 With respect to the z test (statistic) and the t test (statistic), each of the following are true, except: O 1. When using either the z test or the t test, both u and o (or of) are known. O 2. The z test is appropriate when the parameters of the population are known. 3. The t test is appropriate when the parameters of the population are unknown. 4. When using either the z test or the t test, the sampling distribution should be normally distributed