medium · GMAT Verbal
A logistics company found that accidents involving its delivery trucks decreased by 40% after installing GPS-based speed monitors. The CEO concludes that the speed monitors caused the improvement.
Which of the following, if true, most weakens the CEO's conclusion?
- The cost of installing the monitors exceeded the projected savings from the reduction in truck accidents.
- The company also implemented a more rigorous driver-screening process during the same period.
- No delivery truck accident on any route has ever been shown to be completely unavoidable.
- The company's delivery trucks traveled 10% fewer total miles this year than last year.
- The speed monitors were installed in every single truck on the very first day of the calendar year.
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