medium · LSAT Logical Reasoning

A hospital reported that the proportion of patients who developed post-operative infections fell by 30 percent after the introduction of a new sterilization protocol. The hospital administration concluded that the protocol successfully reduced the total number of infections at the facility.

Which one of the following, if true, most clearly exposes the flaw in the administration's conclusion?

  1. The number of surgeries performed at the hospital rose sharply during the period in which the protocol was in use
  2. Most other hospitals in the region have not yet adopted the new sterilization protocol
  3. The new sterilization protocol is more costly to maintain than the methods the hospital used before
  4. The mix of surgical procedures performed at the hospital stayed roughly the same before and after the change
  5. Post-operative infections are generally more dangerous than infections acquired outside of surgery

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