Why would an experimenter use a pretest-posttest design rather ...

[Pineappleeh]

Why would an experimenter use a pretest-posttest design rather than a between groups design to test the benefits of a new therapy even though s/he knew that maturation effects could cause difficulties of interpretation? The reason is that _____.
 
  a. it would probably take too long to use a between groups design
  b. maturation would be even more of a problem in the between groups design
  c. the treatment group would probably tell the control group about their treatment
  d. ethically, it would not be good to withhold a beneficial therapy from a control group

Question 2

The effects of maturation can be reduced by _____.
 
  a. giving the pretest and posttests at different times of the year.
  b. giving the pretest and posttest at the same time of day
  c. keeping the conditions in the pretest and posttest as distinct as possible
  d. all of these

[fffftttt]

Answer to Question 1

D
Ethical considerations sometimes supercede design considerations, especially when the research is intended to find a good way to help people.

Answer to Question 2

B
The conditions of the pretest and posttest should be as similar as possible.

[Pineappleeh]

Wow, this really help

[brbarasa]

Thanks for the timely response, appreciate it