Suppose a researcher is conducting a study that uses biofeedback ...

[saraeharris]

Suppose a researcher is conducting a study that uses biofeedback to monitor subjects' heart rates and subjects are asked to rate their perceived stress levels.
 
  In one condition, subjects listen to their actual heart rates while they rate their stress levels. In the other condition, different subjects listen to a tape recording of a fabricated heart rate and, again, rate their perceived stress. The second condition in this study represents
 
   a. regression to the mean.
   b. an interaction effect.
   c. a placebo control group.
   d. the Hawthorne effect.

Question 2

What did Thumin do to control for subject variables in general?
 
  A) used a control group
  B) used a factorial design
  C) used a between-subjects design
  D) used a within-subjects design

[kiamars2010]

Answer to Question 1

c

Answer to Question 2

D

[saraeharris]

TYSM

[atrochim]

Thanks for the timely response, appreciate it