The quality-control manager at a compact fluorescent light bulb (CFL) factory needs to determine whether the mean life of a large shipment of CFLs is equal to 7,476 hours. The population standard deviation is 900 hours. A random sample of 81 light bulbs indicates a sample mean life of 7,226 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7,476 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. 1 d. Compare the results of (a) and (c). What conclusions do you reach? 85 2 p sest 6 a. Let u be the population mean. Determine the null hypothesis, Ho, and the alternative hypothesis, H. Ho H H Res Help me solve this View an example Get more help- Clear all Check answer STOP-215 ect: Or