Author Question: The z test for independent groups is seldom used because _________. a. it lacks sensitivity b. ... (Read 38 times)

Redwolflake15 · **on:** Jun 19, 2018

The z test for independent groups is seldom used because _________.

a. it lacks sensitivity
b. it is too complicated
c. we seldom know the population variances
d. the sampling distribution of z under H0 is unknown

Question 2

Having just made what you feel is to be a Type II error, using an independent groups design and a t test analysis, which of the following might you do in the next experiment to reduce the probability of a Type II error?

a. increase N
b. change to a correlated groups design
c. try to reduce the variance by better experimental control
d. all of these