Which of the following is an example of an interrupted time-series design?
A) A school wants to try a new teaching program and test its effectiveness. Mrs. Jones' first grade class is given the new program. Mrs. Jones' class and Mrs. Brown's first grade class (who received the traditional teaching method) both take an exam at the end of the year designed to determine the amount that each class learned.
B) The state reduces the speed limit from 65 to 55. Records are gathered showing the number of highway deaths per month for the year prior to the reduction in the speed limit and for the year following the reduction.
C) A new drug treatment for AIDS is being tested. Patients on a waiting list are randomly assigned to receive either the new drug treatment or a placebo. The number of visits to the doctor that the drug group and the placebo group make during the next year will be monitored and compared.
D) Victims of a hurricane are interviewed and asked their opinions about the needs that were not met following the disaster. This information is then turned into a social program to aid disaster victims.
Answer: B
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