Using a pretest-posttest, nonequivalent control group design, ...

[nevelica]

Using a pretest-posttest, nonequivalent control group design, Professor Moriarty takes a group of subjects who received the lowest scores on the pretest and, one day later, runs them through a program that, he believes,
 
  will help the subjects improve their scores. One week later, when the study is finished, Professor Moriarty finds that, indeed, the scores have improved with these subjects. What type of confound does he need to consider in this case?
 
   a. Maturation
   b. Interviewer bias
   c. Regression to the mean
   d. Experimenter bias

Question 2

In an interrupted time-series design, the interrupted aspect refers to when then researcher
 
  a. rudely disrupts the participants, which raises some ethical issues in the study.
  b. takes the study to the real world, where an interruption in the environment occurs.
  c. abruptly calls off the study and sends the subjects home without compensation.
  d. inserts a manipulation or event in between the pretest and posttest.

[medine]

Answer to Question 1

c

Answer to Question 2

d

[nevelica]

Thanks for the timely response, appreciate it

[Dnite]

Gracias!