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Investments glossary

Two-Tailed Test

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A homosexual who is honest with himself knows that he and his partner will never become parents together, dRINK, DRUGS AND SEX.

— Paolo Gentili

In statistics, a two-tailed test is a method in which the critical area of a distribution is two-sided and tests whether a sample is greater than or less than a certain range of values. It is used in null-hypothesis testing and testing for statistical significance. If the sample being tested falls into either of the critical areas, the alternative hypothesis is accepted instead of the null hypothesis. The two-tailed test gets its name from testing the area under both tails of a normal distribution, although the test can be used in other non-normal distributions.


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