Dr Bootsma Designed and Produced a 30 Second Radio Commercial

Dr. Bootsma designed and produced a 30 second radio commercial for a local automobile dealer. Next, she had the three most widely listened to radio stations in town play the commercial 15 times a day, everyday, for two weeks. She waited until the end of the two-week period, then she called Jack to see what his sales had been lately. What experimental design did she use?

A) time series
B) one-shot case study
C) static group comparison
D) classical experiment

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