One of the pairs of terms below consists of two very similar ...

[Wadzanai]

One of the pairs of terms below consists of two very similar threats to validity. Which pair?
 
  A) history and maturation
  B) history and regression toward the mean
  C) experimenter bias and experimental mortality
  D) selection bias and testing effects

Question 2

The Literary Digest error concerning the outcome of the 1936 U.S. Presidential election was apparently caused by:
 
  A) selection bias
  B) nonresponse bias
  C) both selection bias and nonresponse bias
  D) both selection bias and regression toward the mean

[djofnc]

Answer to Question 1

A

Answer to Question 2

C

[Wadzanai]

Thanks for the timely response, appreciate it

[blakcmamba]

YES! Correct, THANKS for helping me on my review