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Which one of the following is a valid pair of null and alternative hypotheses? a) HO : average ROA=0; H1 : average ROA=0; b) HO

Which one of the following is a valid pair of null and alternative hypotheses? a) HO : average ROA=0; H1 : average ROA=0; b) HO : average ROA>0; H1 : average ROA=0; c) HO : average ROA=0; H1 : average ROA0; H1 : average ROA

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