medium · GMAT Verbal
Argument: A hospital implemented a new hygiene protocol that requires doctors to use a specific antiseptic foam before every patient visit. One year later, the rate of hospital-acquired infections dropped by 10%. Thus, the new antiseptic foam was responsible for the reduction in infections.
Which of the following is an assumption required by the argument?
- The cost of the new antiseptic foam is significantly lower than the cost of the liquid soap used before.
- Doctors generally find the new antiseptic foam noticeably easier to use than the liquid soap they used previously.
- Every single doctor working in the hospital faithfully followed the new hygiene protocol for every patient visit.
- The hospital did not also install a new high-efficiency air filtration system during the same one-year period.
- Doctors applied the antiseptic foam correctly each and every time, fully covering all surfaces of both of their hands.
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