9.1.14-T The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the random sample of 81 light bulbs indicates a sample mean life of 7,220 hours a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,470 hours? b. Compute the p-value and interpret its meaning. c. Construct a 95% confidence interval estimate of the population mean life of the light bulbs d. Compare the results of (a) and (c). What conclusions do you reach? a. Let u be the population mean. Determine the null hypothesis, Ho, and the alternative hypothesis, H. Ho = Hy + Question Help FL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,470 hours The population standard deviation is 900 hours A 20 hours life is different from 7,470 hours? mean life of the light bulbs ach? 0, and the alternative hypothesis Hy Ques 9.1.14-T They.cort manager compact crescent light bulb (CFL) factory needs to determine whether the manife of a large shipment of CFLS 15 equal to 7.470 hours The population standard deviation com ample of businessmanie of 7220 hours the deporte evidence that the meante in different from 770 hours? b. Ce the value and where mang Cord confidence intervale of the population med the light bulbs d. Compare the rest of india Wut condons do you reach? be the deputation mean Determine the nethes. He and the tematve hypothesis. Hy