A limitation of ex post facto research is that a. null ...

[D2AR0N]

A limitation of ex post facto research is that
 
  a. null hypotheses cannot be tested.
  b. random sampling is not possible.
  c. behavioral observations are difficult and time consuming.
  d. comparison groups cannot be used.
  e. generalizations concerning cause and effect are difficult to justify.

Question 2

Choose the internal validity problem that is associated with the situations listed. Extreme scores move toward the mean.
 
  a. history
  b. maturation
  c. experimenter effect
  d. statistical regression
  e. diffusion

[jasonq]

Answer to Question 1

E

Answer to Question 2

D

[D2AR0N]

YES! Correct, THANKS for helping me on my review

[triiciiaa]

Thanks for the timely response, appreciate it