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The mean life time of a sample of 400 fluorescent light bulbs produced by a company...

The mean life time of a sample of 400 fluorescent light bulbs produced by a company is found to be 1,570 hours with a standard deviation of 150 hours. Tests the hypothesis that the mean life of bulbs is 1600 hours against the alternative hypothesis that it is greater than 1,600 hours at 1% and 5% level of significance. (Only by R-Lab)

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