One- and two-tailed tests
ALTERNATIVE WAYS OF COMPUTING THE STATISTICAL SIGNIFICANCE OF A PARAMETER INFERRED FROM A DATA SET
One-tailed test; Two-tail test; Two-tail; One-tailed; Two-sided test; Two-tailed test; One-sided test
In statistical significance testing, a one-tailed test and a two-tailed test are alternative ways of computing the statistical significance of a parameter inferred from a data set, in terms of a test statistic. A two-tailed test is appropriate if the estimated value is greater or less than a certain range of values, for example, whether a test taker may score above or below a specific range of scores.