Announcements for 84 upcoming engineering conferences wererandomly picked from a stack of IEEE Spectrum magazines. The meanlength of the conferences was 3.94 days, with a standard deviationof 1.28 days. Assume the underlying population is normal. What isthe error bound of 95% confidence interval for the population meanlength of engineering conferences? Construct a 95% confidenceinterval for the population mean length of engineering conferences.What is the lower bound? Construct a 95% confidence interval forthe population mean length of engineering conferences. What is theupper bound?
