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3: The mean life time of a sample of 90 light bulbs produced by a company is computed to be 1570 hours with a standard

3: The mean life time of a sample of 90 light bulbs produced by a company is computed to be 1570 hours with a standard deviation of 120 hours. If is the mean of all bulbs produced by the company, test the hypothesis that is equal to 1600 hours against the alternative 1600 hours.

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