Regression to the mean implies that if extreme scores are ...

[vicky]

Regression to the mean implies that if extreme scores are obtained for some individuals and then the observations are repeated, the second scores obtained for these same individuals will be
 
  a. closer to the mean of the first scores of the entire group.
  b. more extreme than the first scores of the entire group.
  c. exactly the same as before.
  d. unreliable.

Question 2

Explain why manipulation of an independent variable is a necessary component of an experiment.
 
  What will be an ideal response?

[rekilledagain]

Answer to Question 1

A

Answer to Question 2

In an experiment, manipulation of the independent variable is necessary to avoid the directionality problem and to establish the direction of the relationship. The intent is to demonstrate that the manipulation of one variable (the independent variable) causes changes to occur in a second variable (the dependent variable).