1. For a test of hypothesis using a z statistic, the region of rejection is uniquely determined by the alternative hypothesis and the sample size.
2. The danger in misusing a one-tailed test when a two-tailed test should be used is that it makes a larger than for the proper test.
3. The danger in misusing a two-tailed test when a one-tailed test should be used is that it makes b larger than for the proper test.