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?
- The number of surgeries performed at the hospital rose sharply during the period in which the protocol was in use
- Most of the other hospitals located within the surrounding region have not yet chosen to adopt the new protocol
- The new sterilization protocol turns out to be a good deal more costly to maintain than the methods used before
- The overall mix of surgical procedures performed at the hospital stayed about the same before and after the change
- Post-operative infections are, as a general matter, more dangerous to patients than infections acquired outside of surgery
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