Even though the one-group pretest-posttest design is inadequate, ...

[tichca]

Even though the one-group pretest-posttest design is inadequate, it has one methodological advantage over the one-group posttest-only design, and that is
 
  a. the use of randomization.
  b. external validity.
   c. pretest scores can be compared to posttest scores.
  d. statistical tests are available to use with that design.

Question 2

By including a withdrawal phase after the basic time-series design (i.e making it an A-B-A design),
 
  a. the participant finishes the study with the best outcome.
  b. we can fulfill our ethical responsibilities to the participant.
   c. we may rule out history effects as a plausible rival hypothesis.
  d. we will show that the behavior changes are unimportant.

[tjayeee]

Answer to Question 1

C

Answer to Question 2

C

[tichca]

Thanks for the timely response, appreciate it

[ryhom]

Gracias!