Author Question: There are two values for tcrit when H1 is directional. Indicate whether the statement is true or ... (Read 95 times)

jc611 · **on:** Jun 19, 2018

There are two values for tcrit when H1 is directional.

Indicate whether the statement is true or false

Question 2

In general, the z test is more powerful than the t test because _________.

a. with the z test, the sample mean is closer to the population mean than with the t test
b. with the t test we lose a degree of freedom
c. the standard deviation of the sample raw scores is larger with the t test
d. with the z test, we know , whereas with the t test, we must estimate it.