Quote:
A safety report indicates that, on average, traffic fatalities decline by about 7 percent in those areas in which strict laws requiring drivers and passengers to wear seat belts have been passed. In a certain city seat belt laws have been in effect for two years, but the city's public safety records show that the number of traffic deaths per year has remained the same.
Which one of the following, if true, does NOT help resolve the apparent discrepancy between the safety report and the city public
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