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® 9.1 .14-T :5 Question Help or The quality—control manager ata compact ﬂuorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7.50?

hours. The population standard deviation is 1,030 hours. A random sample ofﬂl light bulbs indicates a sample mean life of I20? houm. a. At the 0.05 level ofsigniﬁcance, is there evidence that the mean life is different from ?,50? hours? b. Compute the p-value and interpret its meaning. 0. Construct a 95% conﬁdence interval estimate of the population mean life oi the light bulbs.

d. Compare the results ot (a) and (e). What conclusions do you reach? a. Let p, be the population mean. Determine the null hypothesis, Ho: and the alternative hypothesis, H1. Ho:p= r50?

Hp“: r50? What is the test statistic? ZSTAT = Cl (Round to two decimal places as needed.) Enter your answer In the answer box and then click Check Amwer. ® saglning - CIearAII CheckAnswer l 4 )