When an investigator typically devises two different conditions and then studies and compares the outcomes of the participants exposed to those two different conditions in order to see how behavior is affected, this is called a(n):

Experiment

Explanation:An experiment can be defined as the process carried out to prove a scientific logic. These experiments are done on the basis of predetermined procedure that is strictly followed.

In the given case, the individuals that are put in two different conditions are the samples for the experiment the investigator is doing on human behavior. Putting those individuals in a situation is the procedure.

Thus, we can conclude that the given case is an example of experiment.

a: social security and social programs

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.