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One- and two-tailed tests - Wikipedia


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 ...

One-Tailed Test: Definition - Stat Trek


Definition of one-tailed test, from the Stat Trek dictionary of statistical terms and concepts. This statistics glossary includes definitions of all technical terms used ...

One-tailed and two-tailed tests (video) | Khan Academy


Now if we wanted to do a one-tailed test, but for some reason we already ... If you want to do one-tailed test, you could say that the drug lowers response time.

What is a one-tailed test? - PsychWiki - A Collaborative Psychology ...


Nov 18, 2010 ... One tailed test is a test of a directional hypothesis, where we have a ... the statistics book” statistically, the test would be called one-tailed test.

One Tailed Test or Two in Hypothesis Testing. How to Decide.


Nov 4, 2009 ... How to figure out if you have a one tailed test or two in hypothesis testing. Includes video. Free help forum, online calculators.

1- vs 2-Tailed Tests


Because we were only interested in one side of the distribution, or one "tail", this type of test is called a one-sided or a one-tailed test. When you are using tables ...

Test of hypothesis (one-tail)


In this circumstance a one-tailed test is employed. The null hypothesis (H0) for a one tailed test is that the mean is greater (or less) than or equal to µ, and the ...

Chapter 7: Hypothesis Testing - Kennesaw State University


Ha: m 2.73. A one-tailed test is one where Ha is directional and includes < or >. or ... What is the critical value for a one-tailed test and a 95% level of confidence?

One-Tail vs Two-Tail Testing (Does it Matter?) - ConversionXL


Jul 31, 2015 ... The one tailed test takes as a null hypothesis the belief that the variation is not better than the control, but could be worse.” (quote source).

significance test - power analysis - Power and Precision


A one-tailed test is a test that will be interpreted only if the effect meets the criterion for significance and falls in the observed direction (i.e. the treatment improves ...

One-Tailed Test
A statistical test in which the critical area of a distribution is one-sided so that it is either greater than or less than a certain value, but not both. If the sample that is being tested falls into the one-sided critical area, the alternative hypo... More »
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FAQ: What are the differences between one-tailed and two-tailed tests


Because the one-tailed test provides more power to detect an effect, you may be tempted to use a one-tailed test whenever you have a hypothesis about the ...

One-Tailed Test Definition | Investopedia


A one-tailed test is a statistical test in which the critical area of a distribution is one-sided so that it is either greater than or less than a certain value, but not both.

Stata | FAQ: One-sided tests for coefficients


The results from estimation commands display only two-sided tests for the coefficients. How can I perform a one-sided test?