Question: Predicting stress level. In Example 10.8, software predicts the mean stress level of accountants with an LOC of 16 to be y = 2.894.We also

Predicting stress level. In Example 10.8, software predicts the mean stress level of accountants with an LOC of 16 to be ˆy = 2.894.We also see that the standard error of this estimated mean is SEμˆ = 0.0722. These results come from data on 100 accountants.

(a) Use these facts to verify by hand Minitab’s 95% confidence interval for the mean stress level when LOC = 16.

(b) Use the same information to give a 90% confidence interval for the mean stress level.

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