Author Question: What are the advantages of designs incorporating random assignment? What will be an ideal ... (Read 40 times)

LaDunn · **on:** Jun 20, 2018

What are the advantages of designs incorporating random assignment?

What will be an ideal response?

Question 2

When a pretest and posttest are used on all subjects in the experimental and control groups

a. the pretest may influence posttest results.
b. the experimenter knows whether it is reasonable to assume that both groups began at a similar point.
c. there may be interaction between pretest and treatment effects.
d. a and b
e. a, b, and c

LP · **Reply #1 on:** Jun 20, 2018

Answer to Question 1

It provides the best method of control of extraneous variables. When random assignment has been used, the comparison groups in an experiment can be considered statistically equivalent before the research treatment begins.

Answer to Question 2

E