testone-tailed hypothesis test

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  c) For the one tailed t-test, the resulting P value is only half of a two tailed P value. Therefore, it is more likely to reject the null hypothesis for a one tailed test than for a two tailed test.

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  So as a two-tailed test, the null hypothesis becomes: Hypotheses: H0: 1 = 2 vs.

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  Therefore, the directional hypothesis could be evaluated by one-tailed t-test.