One-tailed test
A statistical test where a difference between two groups, if true, is expected to be in one direction. For example, the difference between passive smokers and non-smokers in the occurrence of lung cancer is expected to be in one direction. It is not expected that smoking will protect from lung cancer, and so there is no need to test for it. A one-tailed test will need a smaller sample size than a two-tailed test.
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