- The Quality Control Manager At A Compact Fluorescent Light Bulb Cfl Factory Needs To Determine Whether The Mean Life O 1 (389.63 KiB) Viewed 81 times
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 7540 hours. The population standard deviation is 1,350 hours. A random sample of 81 light bulbs indicates a sample mean life of 7.300 hours. a. At the 0.05 level of significance, is there evidence that the mean life is different from 7540 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? e. Compare the results of parts (a) through (d) to those when the standard deviation is 900 hours. a. Let p be the population mean. Determine the null hypothesis, Ho, and the alternative hypothesis, Hi. Нор 7540 Hyp# 7540 What is the test statistic? ZSTAT -50 (Round to two decimal places as needed.)