Author Question: In a study comparing two nonequivalent groups, a selection-history confound occurs when a. some ... (Read 53 times)

rosent76 · **on:** Jul 13, 2018

In a study comparing two nonequivalent groups, a selection-history confound occurs when

a. some event intervenes between pretest and posttest and affects just one of the groups.
b. some event intervenes between pretest and posttest and affects both selected groups equally.
c. selection influences one of the groups and history influences the other.
d. some historical event causes a failure of the random assignment procedure.

Question 2

How could Dr. Benning's study be improved?

a) offer no inducements
b) use non-prisoners
c) randomly assign only non-smokers to the conditions
d) use a more sensitive dependent measure