Mathematics, 03.04.2020 21:28 alma79

Announcements for 84 upcoming engineering conferences were randomly picked from the 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% 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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