It has been noted that there are plumbing failures that occur during the half-time period of high profile sporting events. In order to investigate this claim, Dr. Halfback reviewed the municipal records of several large American cities for emergency calls during the dates and times of Super Bowls and NBA Championships. This is an example of a(n) :
A) observational study.
B) experiment.
C) survey.
D) case study.
Correct Answer:
Verified
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