Which of the following constitutes a threat to the internal ...

[eruditmonkey@yahoo.com]

Which of the following constitutes a threat to the internal validity of within subjects factorial designs?
 
  a. testing c. history
  b. the carryover effect d. all of these

Question 2

In a within subjects design, _____.
 
  a. each subject is his or her own control
  b. subjects are randomly assigned to conditions
  c. subjects experience only one level of the treatments
  d. all of these

[nmyers]

Answer to Question 1

D
The internal validity of the within subjects factorial design is threatened by all of factors that threaten the simple within subjects designs (e.g., testing, maturation, and history). In addition, the carryover effect poses a threat to within subjects factorial designs.

Answer to Question 2

A
Within subjects means that each subject serves as his or her own control. In a between subjects design, participants are randomly assigned to experience only one level of the treatment.