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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.

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