In Exercise 12 of Chapter 1 a study of characteristics of successful salespersons indicated that 44 of 120 sales managers rated reliability as the most important characteristic in salespersons. A study of a different industry showed that 60 of 150 sales managers rated reliability as the most important characteristic of a successful salesperson.

(a) At the 0.05 level of significance, do these opinions differ from one industry to the other?

(b) Construct the power curve for this test. (Hint: The horizontal axiswill be the difference between the proportions.)

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