If an investigator created groups that differed in the amount of ...

[Bob-Dole]

If an investigator created groups that differed in the amount of exposure participants received to a persuasive message, the independent variable would be
 
  a. a task variable.
  b. a subject variable.
  c. a quantitative variable.
  d. a measured variable.

Question 2

When researchers use existing data to create groups for comparison, the approach is known as
 
  a. ex post facto.
  b. experimental.
  c. operational.
  d. quasi-experimental.

[triiciiaa]

Answer to Question 1

c

Answer to Question 2

d