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Hypothesis testing of Single mean.

The quality-control manager at a light bulb factory needs to find out whether the mean life of a population of light bulbs is equal to 375 hours. A random sample of 64 light bulbs indicates the sample mean of 350 hours and a standard deviation of 100 hours. At a 5 percent level of significance, is there evidence to conclude that the mean life is different from 375 hours?

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