Answer Happy

Posted: **Mon Jul 11, 2022 11:28 am**

: The Quality Control Manager At A Compact Fluorescent Light Bulb Cfl Factory Needs To Determine Whether The Mean Life O 1 (19.01 KiB) Viewed 25 times

: The Quality Control Manager At A Compact Fluorescent Light Bulb Cfl Factory Needs To Determine Whether The Mean Life O 2 (20.87 KiB) Viewed 25 times

: The Quality Control Manager At A Compact Fluorescent Light Bulb Cfl Factory Needs To Determine Whether The Mean Life O 3 (41.22 KiB) Viewed 25 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 7,510 hours. The population standard deviation is 1,080 hours. A random sample of 81 light bulbs indicates a sample mean life of 7,210 hours.

What is the test statistic? ZSTAT 2.50 (Round to two decimal places as needed.) What is/are the critical value(s)? 1.96 (Round to two decimal places as needed. Use a comma to separate answers as needed.)

c. Compare the results of (a) and (c). What conclusions do you reach? OA. The results of (a) and (c) are not the same: there is not sufficient evidence to prove that the mean life is different from 7,510 hours. B. The results of (a) and (c) are not the same: there is sufficient evidence to prove that the mean life is different from 7,510 hours. OC. The results of (a) and (c) are the same: there is sufficient evidence to prove that the mean life is different from 7,510 hours. OD. The results of (a) and (c) are the same: there is not sufficient evidence to prove that the mean life is different from 7,510 hours.