The fact that you cannot be relaxed and agitated at the same time best illustrates the central concept in Joseph Wolpe's theory of

The time during fetal growth when specific parts or organs develop is known as _______.

a) critical period b) mitosis c) conception d) pregnancy

What differentiates chi square from other types of hypothesis testing?

a. Categorical variables b. Continuous variables c. Does not have an alternative d. Two independent variables