(Answered) A random sample of n 14 9 lightbulbs with a mean operating

Statistics

A random sample of n 1/4 9 lightbulbs with a mean operating life of 300 h and a standard deviation s of 45 h is picked from a large shipment of lightbulbs known to have a normally distributed operating life.

(a) Find the 90% confidence interval for the unknown mean operating life of the entire shipment.

(b) Sketch a figure for the results of part a.

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