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 hypothesi

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answerhappygod
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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 hypothesi

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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 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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