External validity refers to the extent to which a. research ...

[jessicacav]

External validity refers to the extent to which
 
  a. research results can be generalized to other situations
  b. the experimenter unintentionally communicates his or her expectations to the participants
  c. historical events occurred that accompanied one or more of the experimental treatments
  d. the observed relationship is a true cause-effect relationship

Question 2

If you wanted to make sure that fingernail biting was a good way to classify your participants regarding their anxiety level by also testing them with the Taylor Manifest Anxiety Scale, you would have used a(n)
 
  a. validity verification
  b. generalization evaluation
  c. manipulation check
  d. extraneous variable

[nikmaaacs]

Answer to Question 1

a

Answer to Question 2

c

[jessicacav]

Thanks for the timely response, appreciate it

[mammy1697]

YES! Correct, THANKS for helping me on my review