In statistical significance testing, a one-tailed test and a ... - dofaq.co
one  and two tailed tests

In statistical significance testing, a one-tailed test and a ...

wikipedia - 23 Sep 2015
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 used if deviations of the estimated parameter in either direction from some benchmark value are considered theoretically possible; in contrast, a one-tailed test is used if only deviations in one direction are considered possible. Alternative names are one-sided<

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