Evaluate effect of treatment using hypothesis test

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A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment. The hypothesis test produces a z-score of z = 2.77. Assuming that the researcher is using a two-tailed test.

The researcher rejects the null hypothesis with a= .05 but not with a= .01.
The researcher should reject the null hypothesis with either a= .05 or a= .01.
The researcher should fail to reject H0 with either a= .05 or a= .01.

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