Author Question: Selection bias can be a potential threat to internal validity when subjects are assigned to groups ... (Read 136 times)

HCHenry · **on:** Jul 13, 2018

Selection bias can be a potential threat to internal validity when subjects are assigned to groups

a. in a random fashion
b. on the basis of different criteria for the different groups
c. in a way that insures that similar people are in each group
d. none of the above

Question 2

Covariance means to vary together. What is the opposite of covariance in a bivariate
relationship?

A) scattergram B) anticovariance
C) univariance D) statistical independence