Problem:
Experiments are often conducted in public health research, where a distinction is made between an efficacy experiment and an effectiveness experiment. Efficacy experiments focus on whether some new health program works under ideal conditions; effectiveness experiments test the program under typical conditions that health professionals encounter in their day-to-day work. Discuss how efficacy experiments and effectiveness experiments reflect concerns about internal validity threats on the one hand and generalizability on the other.
Minimum of two Scholarly Internet sources. (Wikipedia and ask.com are NOT considered scholarly sources of information.)