The Bed Net Distribution (BND) Program distributes bed nets to communities to help prevent increases in malaria incidence. For each condition, briefly describe one potential threat to INTERNAL validity and recommend how the outcome evaluation could be re-designed to address or minimize this threat.
Condition 1: A simple one-group pretest-posttest design; where subjects who agree to be observed as part of the evaluation tend to be more highly educated than the typical individual of the broader target population.
Condition 2: A simple one-group pretest-posttest design; the evaluation of this program begins in July and ends in September. Throughout this time period, malaria rates throughout the country tend to drop significantly simply due to the change in seasons.
Condition 3: A non-equivalent control group design in which the experimental group is more highly educated (on average) than the control group.