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please QUESTION 3 Announcements for 84 upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean length of the conferences

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QUESTION 3 Announcements for 84 upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean length of the conferences was 3.94 days, with a standard deviation of 1.28 days. Assume the underlying population is normal. Construct a 95% confidence interval for the population mean length of engineering conferences. (3.71, 4.17) O (3.82, 4.29) (3.66, 4.21) (3.58, 4.42)

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