Identify an advantage of the randomized subjects control-group, ...

[Starlight]

Identify an advantage of the randomized subjects control-group, posttest only design in comparison to the randomized subjects, control-group, pretest-posttest design.
 
  What will be an ideal response?

Question 2

Counterbalancing is a technique that controls for
 
  a. lack of random assignment.
  b. failure to use a double blind technique.
  c. experimenter effect.
  d. order and carryover effects.
  e. diffusion.

[aburgess]

Answer to Question 1

The randomized subjects control-group, posttest design does not use a pretest. This is advantageous in situations where (a) a pretest is not available or is not appropriate for the subjects and (b) where there might be an interaction effect between the pretest and the independent variable. By not having a pretest, one threat to internal validity is eliminated.

Answer to Question 2

D

[Starlight]

Wow, this really help

[raili21]

Gracias!