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The Rejection Region for a Two-Tail Test

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The rejection region for a two-tail test that uses the standard normal distribution is that area under the distribution lying:

a. between 0 and the positive cutoff value for Z.
b. between the positive cutoff value for Z and the negative cutoff value for Z.
c. between 0 and the negative cutoff value for Z.
d. to the right of the positive cutoff value for Z and to the left of the negative cutoff value for Z.

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Solution Summary

The rejection region is determined for a two-tail test that uses standard normal distribution.

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In order to determine where the rejection region is under the standard normal distribution, two essential pieces of information are whether the test is one-tailed or two-tailed and the alpha level for the test. For the present problem, the alpha level is not relevant because the actual cutoff value or values for Z do not need to be found. You just need to find out on which side of the cutoff value ...

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