A company has a device that purports to increase the   life of   lightbulbs.                                 To   test this claim, you purchase a sample of 10 lightbulbs that have   an                                 advertised   life of 2000 hours and see how long they last with the use   of                                 the   device. You obtain the values   below.                                 Bulb Life                                                       alpha   = .05    test   to see if the device works as claimed