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Worker productivity is assessed before and after a program for flextime is instituted. Just after the pretest, workers receive an unexpected bonus check based on unusually high product sales. Productivity is higher on the posttest than on the pretest, but the researcher suspects ______ as a threat to internal validity.
Sympathetic Effect
The body's response to stress, often described as the "fight or flight" reaction, mediated by the sympathetic nervous system.
Increased Heart Rate
A condition where the heart beats more times per minute than the normal range, which can occur due to various factors.
Urinary Bladder
A hollow muscular organ that stores urine from the kidneys before it is disposed by urination.
Parasympathetic Effect
The impact of the parasympathetic nervous system, which promotes relaxation, digestion, and nutrient absorption, counterbalancing the sympathetic system.
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