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A recent study of an insurance company's under - writers indicated that those who worked in pleasant physical surroundings were 25% more productive than their peers in an unpleasant physical surroundings. Objective criteria for evaluating job performance included caseload and complexity of cases. This shows that improving workers environments increase those worker's productivity.

Which of the following, if true, most seriously weakens the conclusions above?

  1. On average, less productive employees spend to fewer hours per day at their workstation than do their more-productive peers.
  2. Unpleasant surroundings gives employees less motivation to work hard than more pleasant surroundings do.
  3. The more productive employees are generally rewarded with pleasant office space.
  4. More productive employees do not work any more hours than their less productive peers.
  5. peer pressure discourages employees in crowded, unpleasant surroundings from making phone calls to their own family members during work time.

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