A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours. To test this claim, a reputable testing firm took a random sample of 100 bulbs and life...

Extracted text: A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is more than 4000 hours. To test this claim, a reputable testing firm took a random sample of 100 bulbs and life tested them. The testing firm found the average life of the sample to be 4500 hours with a sample standard deviation, s = 400 hours. The value of the test statistic for this problem is 1.25 -1.25 O 12.5 O -12.5 None of the values listed are correct


Extracted text: A manufacturer of new light bulbs claims the average lifetime of its long-life bulb is.more than 4000 hours. To test this claim, a reputable testing firm took a random sample of 100 bulbs and life tested them. The testing firm found the average life of the sample to be 4500 hours with a sample standard deviation, s = 400 hours. Select the appropriate null and alternative hypothesis used to test the manufacturer's claim. HO: u = 4000 against H1: u < 4000="" ho:="" u="">< 4500="" against="" h1:="" µ="4500" ho:="" u="4000" against="" h1:="" µ=""> 4000 HO: u = 4000 against H1: µ < 4000="" o="" ho:="" u="4000" against="" h1:="" h="4500">