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The mean life time of 400 batteries produced by a company is found to be 1800 hrs with S.D of 95 hrs. Test the hypothesis

The mean life time of 400 batteries produced by a company is found to be 1800 hrs with S.D of 95 hrs. Test the hypothesis that the mean life time of the batteries produced in general is higher than that the mean life of 1790 hrs at i) a=0.01 ii)a=0.05

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