In a certain study, different interviewers are used in a pretest ...

[sammy]

In a certain study, different interviewers are used in a pretest from those used in the posttest and this produces different results in the study. This is an example of a(n) ____.
 a. history effect
  b. mortality effect
  c. instrumentation effect
  d. cohort effect

Question 2

A set of high school students who take the ACT in their junior year perform better on that exam during their senior year because they know better how to take the exam due to what they experienced on the first exam. This is an example of a(n) ____.
 a. mortality effect
  b. testing effect
  c. history effect
  d. instrumentation effect

[milbourne11]

Answer to Question 1

C

Answer to Question 2

B

[sammy]

Thanks for the timely response, appreciate it

[marict]

Excellent