Statistics and Probability Dictionary
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One-Tailed Test
A test of a
statistical
hypothesis
, where the
region of rejection
is on only one side of the
sampling distribution
, is called a one-tailed test.
For example, suppose the
null
hypothesis
states that the mean is less than or equal to 10. The
alternative hypothesis would be that the mean is greater than 10. The region of
rejection would consist of a range of numbers located on the right side of
sampling distribution; that is, a set of numbers greater than 10.