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## One- and two-tailed tests

en.wikipedia.org/wiki/One-_and_two-tailed_tests

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

stattrek.com/statistics/dictionary.aspx?definition=One_tailed_test

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 ...

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

www.psychwiki.com/wiki/What_is_a_one-tailed_test?

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.

## The Difference Between One-Tailed & Two-Tailed Testing - Maxymiser

www.maxymiser.com/resources/blog/difference-between-one-tailed-two-tailed-testing

Mar 5, 2015 ... In other words, a one-tailed test tells you the effect of a change in one direction and not the other. Think of it this way, if you are trying to decide if ...

## One–tailed | Definition of One–tailed by Merriam-Webster

www.merriam-webster.com/dictionary/oneâ€“tailed

being a statistical test for which the critical region consists of all values of the test statistic greater than a given value or less than a given value but not both ...

## 1- vs 2-Tailed Tests

www.chem.utoronto.ca/coursenotes/analsci/stats/12tailed.html

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 ...

## Stata | FAQ: One-sided tests for coefficients

www.stata.com/support/faqs/statistics/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?

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

www.statisticshowto.com/one-tailed-test-or-two/

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.

## One tailed hypothesis tests.

www.uh.edu/~odonnell/econ2370/onetailed.html

Why would you want to use a one tailed test? To find out if the true parameter ( e.g., mean, proportion, difference in means, differences in proportions) is greater  ...

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

conversionxl.com/one-tailed-vs-two-tailed-tests/

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).

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 »

### FAQ: What are the differences between one-tailed and two-tailed tests

www.ats.ucla.edu

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

www.investopedia.com

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.

### Test of hypothesis (one-tail)

www.cs.uni.edu

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 ...