AP PSYCHOLOGY

Detailed explanation-1: -In another example, a well-known natural experiment in Helena, Montana, smoking was banned from all public places for a six-month period. Investigators later reported a 60-percent drop in heart attacks for the study area during the time the ban was in effect.

Detailed explanation-2: -In a natural experiment, the researcher finds a situation in which causes have been assigned to subjects essentially at random out in the world. Example 1: What is the effect of military service on income? Say a researcher wants to know the impact of military service on income.

Detailed explanation-3: -Natural experiments are studies where the experimenter cannot manipulate the IV, so the DV is simply measured and judged as the effect of an IV. For this reason, participants cannot be randomly allocated to experimental groups as they are already pre-set, making them quasi-experiments.

Detailed explanation-4: -Natural experiments are observational studies which can be undertaken to assess the outcomes and impacts of policy interventions. They are often possible where there is a divergence in law, policy or practice between nations, regions or other political, jurisdictional or social units.