medium · GMAT Verbal
A supermarket manager concludes that newly installed temperature sensors reduced produce waste by 30%. The manager's only evidence is that the store discarded 30% less produce in the quarter after the sensors were installed than in the preceding quarter.
Which of the following, if true, most weakens the manager's argument?
- The sensors cost less to maintain than the refrigeration controls they supplemented.
- Customer traffic was slightly higher in the quarter after the sensors were installed.
- At the start of that quarter, the store changed to a supplier whose produce arrived pre-cooled and had a longer remaining shelf life.
- Produce employees reported that the sensor alerts were easy to understand.
- The store plans to install similar sensors in its bakery refrigerators next year.
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