Question: Variable description :

StressIndex: Stress index for managers

An industrial psychologist has a stress test that is used to determine the amount of stress that managers are under. A value of 80 or higher indicates "high stress." The industrial psychologist believes that the managers at a large, profitable pharmaceutical firm are not under "high stress" and that the average stress index is less than 80 for managers of the company. A random sample of 50 managers is selected, and their stress index was recorded.

1. Test that the data support the industrial psychologist’s belief.
2. What conclusion would you reach if the significance level was .10? .05? .01?

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