Which of the following threats to internal validity is most likely to be a problem in the nonequivalent comparison group design?
a. history
b. maturation
c. selection bias
d. all of the above are potential problems
Question 2
This design is a
a) 2X3 between-participants factorial design.
b) 2X3 within-participants factorial design.
c) 2X2 mixed-model factorial design.
d) 2X2 between-participants factorial design.
