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A company claims a mean battery life of 42 months.A sample of 36 yields a mean of 39 months with a deviation of 7 months. Test the null hypothesis,...

A company claims a mean battery life of 42 months.A sample of 36 yields a mean of 39 months with a deviation of 7 months. Test the null hypothesis, Ho: mu = with alpha 0.05


A. Fail to reject Ho

B. Reject Ho

C. Fail to reject Ha

D. Reject Ha

E. Not given

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