Statistics- A manufacturing process that has been used for many years produces
QUESTION
A manufacturing process that has been used for many years produces light bulbs with a mean life of 1,000 hours and a standard deviation of 100. A new process has been developed. A sample of 36 tubes produced by the new process has a mean of 1,065 hours. The engineers hope that the new process produces bulbs which last longer. Do the new tubes last significantly longer? Use α = .01.
ANSWER:
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