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Which is NOT an example of a situation when you might suspect and test for a structural break in the data?
Consumers' airfare costs before and after September 11, 2001.
Consumers' demand for turkeys at Thanksgiving relative to all other periods of the year.
Voting behavior in northeastern United States versus southern United States.
Incidents of polio illnesses before and after the introduction of a polio vaccine.
Children's asthma incidences before and after a coal power plant is built.