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Explain how the pretest-posttest control-group design controls for the following threats to internal validity: (a) selection, (b) history, (c) maturation, (d) testing, and (e) statistical regression.
Unemployment Insurance
The social insurance program that in the United States is financed by state payroll taxes on employers and makes income available to workers who become unemployed and are unable to find jobs.
Opportunity Costs
Choosing one option results in the forfeiture of potential gains from other available choices.
Sitting in Traffic
The state of being in a vehicular traffic jam, often resulting in delayed travel times and increased frustration.
Adverse Selection
A market process in which undesired results occur due to information asymmetry between buyers and sellers, where one party has more or better information than the other.
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