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A quality control engineer finds that a sample of 100 light bulbs had an average life-time of 470 hours. Assuming a population standard deviation of
A quality control engineer finds that a sample of 100 light bulbs had an average life-time of 470 hours. Assuming a population standard deviation of = 25 hours, test whether the population mean is 480 hours vs. the alternative hypothesis < 480 at a significance level of = 0:05.
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