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Is it possible to reject the null hypothesis without calculating the z-score? We estimated the to be 0.05

—>2* = 0.1; and 2σ = 95% (empirical rule)

Therefore there is a 95% confidence interval between0.95(=1.05 - 0.1) and1.15(=1.05+0.1)

So we can say we are 95% confident that the μ_{x}(of the drug administered rats) is between 0.95 and 1.15. Therefore we can reject the hypothesis because μ of the non-drug-rats is 1.2, which falls outside of the 95%.

Is this reasoning correct?

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# I Rejecting a null hypothesis without a z-score or p-value?

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