medium · LSAT Logical Reasoning

A hospital administrator observed that patients who received visits from therapy dogs recovered from surgery 15 percent faster than patients who did not. The administrator concluded that the emotional support provided by the dogs directly accelerated the physical healing process.

Which one of the following, if true, most strengthens the administrator's conclusion?

  1. Patients were assigned at random either to a group that received therapy-dog visits or to a control group that received none
  2. Nursing staff on the wards reported feeling noticeably less stressed during the days when the therapy dogs were present nearby
  3. Around the same time, the hospital upgraded much of its surgical equipment, producing faster recovery times throughout the facility
  4. A sizeable share of the patients who received the therapy-dog visits had themselves owned one or more pets at some point in the past
  5. Therapy-dog visits are said to guarantee a faster recovery for every single surgical patient regardless of any other circumstance

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