4. Let 4. s say the personnel director in Problem 1 obtained X 48 based on a...

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4. Let 4. ’s say the personnel director in Problem 1 obtained X 48 based on a sample of size 36. Further suppose that σ 10, α 05, and a two-tailed test is conducted.

(a) Calculate σX .

(b) Calculate z.

(c) What is the probability associated with this test statistic?

(d) What statistical decision does the personnel director make? (Explain.)

(e) What is her substantive conclusion?

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