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1)Announcements for82upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean length of the conferences was2.91days.The population standard deviation is1.21days.Assume

1)Announcements for82upcoming engineering conferences were randomly picked from a stack of IEEE Spectrum magazines. The mean length of the conferences was2.91days.The population standard deviation is1.21days.Assume the underlying population is normal.

Construct a 95% confidence interval for the population mean length of engineering conferences.

(i) State the confidence interval. (Round your answers to two decimal places.)

( , )

(ii) Sketch the graph. (Round your answers to two decimal places. Enter your/2 to three decimal places.)

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