Math 3 Quiz
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STATISTICS & PROBABILITY
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A city implemented a new traffic safety campaign and wants to evaluate its effectiveness. They compared accident rates in the 6 months before the campaign (180 accidents) with the 6 months after (145 accidents). The 19% reduction was statistically significant (p = 0.03). City officials concluded the campaign successfully reduced accidents.
Which factor most seriously challenges the conclusion that the campaign caused the accident reduction?
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