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96 Announcements for 84 upcoming engineering conferences were randomly picked from a stack of IEEE...

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96 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 a In words define the random variables X and X b Which distribution should you use for this problem Explain your choice c Construct a 95 percent confidence interval for the population mean length of engineering conferences i State the confidence interval ii Sketch the graph iii Calculate the error bound

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