1 (14 pts). A manager of a LED lightbulb factory wants to kn…

1 (14 pts). A manager of a LED lightbulb factory wants to know the population mean lift expectance of the bulbs manufactured. A sample of 28 bulbs is selected and the sample mean x– = 36900 hours and the sample standard deviation s = 594 ounces.  (a) What is the population? What is the sample? (b) Construct a 90% confidence interval for the population mean.