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two-tailed

British

adjective

statistics (of a significance test) concerned with the hypothesis that an observed value of a sampling statistic differs significantly from a given value, where an error in either direction is relevant: for instance, in testing the fairness of scales, an inspector will seek to exclude both overweight and underweight goods Compare one-tailed

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Is this a one-tailed test or two-tailed test?

From Textbooks • Nov. 29, 2017

The following examples illustrate a left-, right-, and two-tailed test.

From Textbooks • Sep. 19, 2013

Is this a left-tailed, right-tailed, or two-tailed test?

From Textbooks • Sep. 19, 2013

If you input the lists in a different order, you get a test statistic of 0.3335 but the p-value is the same because this is a two-tailed test.

From Textbooks • Sep. 19, 2013

To her sails had been stitched gaudy ramping lions of scarlet saye, and from her mainyard, now dipping in the water, had hung the broad two-tailed pennant with the Virgin and Child embroidered upon it….

From Widdershins by Onions, Oliver [pseud.]

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023