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A factory conducts an experiment to see if a new ergonomic workstation design reduces worker fatigue. The company announces the study and monitors workers' productivity and reported fatigue levels for three months. Productivity and reported fatigue both improve substantially. What is the primary threat to concluding that the new workstation causes the improvement?
A factory conducts an experiment to see if a new ergonomic workstation design reduces worker fatigue. The company announces the study and monitors workers' productivity and reported fatigue levels for three months. Productivity and reported fatigue both improve substantially. What is the primary threat to concluding that the new workstation causes the improvement?