Question
A bulb manufacturing company claims that the average longevity of their bulb is 4 years with a standard deviation of 0.16 years. A random sample
A bulb manufacturing company claims that the average longevity of their
bulb is 4 years with a standard deviation of 0.16 years. A random sample of
40 bulbs gave a mean longevity of 3.45 years. Does the sample mean to justify
the claim of the manufacturer? Use a 5 per cent level of significance.
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Brief Calculus & Its Applications
Authors: Larry J Goldstein, David C Lay, David I Schneider, Nakhle I Asmar
13th Edition
0321888510, 9780321888518
