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