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For the following questions: Identify whether it is an experiment or an observation study/survey. If experiment: identify experimental design, experimental units, factors & levels, response variable, and blocks (if any). If study/survey, identify sampling method and one possible source of bias. An economist wants to determine if differences exist among the salaries of university professors in different departments. Data is collected from a random sample of six professors from each of the departments of business, history, and psychology

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