Manuello Did an Experiment on Workers in an Insurance Company

Manuello did an experiment on workers in an insurance company to examine the effect of a new computer system on workers' attitudes and productivity.He had no control group.He noticed that as he simplified the computer system,worker productivity and positive attitude went up.He then complicated the computer system and monitored the workers closely,only to discover that their productivity and positive attitude again increased.What was probably at work?

A) the Rosenthal effect
B) a badly measured independent variable
C) a badly measured dependent variable
D) the Hawthorne effect
E) the psychological effect

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