Time left 1:30:44 You can drag and drop files here to add them. on 5 The quality control manager at a light bulb factory needs to determine whether the t mean life of a large shipment of light bulbs is equal to 400 hours. The population red standard deviation is 100 hours. A random sample of 50 light bulbs indicates a ed out of sample mean life of 300 hours. At the 0. 10 level of significance, is there evidence that the population mean life is different from 400 hours? ag tion A v B I E SS