One of the reasons that researchers will often use an existing ...

[Engineer]

One of the reasons that researchers will often use an existing questionnaire rather than designing their own is
 
  a. To minimize history as a threat to internal validity
  b. In situations where the purpose of the questionnaire is poorly defined
  c. To be able to compare their results to others who have used the survey
  d. In situations where the variables of interest are unclear

Question 2

The Mental Measurement Yearbook series
 
  a. Is the official publication of MENSA
  b. Reviews many standardized tests, including questionnaires
  c. Is used to survey outgoing college seniors
  d. Contains information about famous psychologists

[jharrington11]

Answer to Question 1

c

Answer to Question 2

b

[Engineer]

YES! Correct, THANKS for helping me on my review

[Dominic]

Thanks for the timely response, appreciate it