*Choose Index below for a list of all words and phrases defined in this glossary.*

**F Test** - F test - test of whether two samples are drawn from different populations have the same standard deviation, with specified confidence level. Samples may be of different sizes.

[Category=Data Quality ]

*Source: iSixSigma, 21 January 2011 08:36:52, https: web.archive.org/web/20111109014246/http:www.isixsigma.com/index.php?option=com_glossary *

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**F-tests **- used to test variances or dispersion effects. Fpr example, if a company has two manufacturing lines making the same product but different regions of the world, a F-test may be used to compare the variance of one line's output vs. that of the other. [Statistical inference tests to compare the quality of different products / processes and compare the performance of different groups.]

[Category=Quality ]

*Source: The Quality Portal, 07 April 2011 07:52:52, http://thequalityportal.com/glossary/b.htm *

**F test** - [statistics] A statistical test for determining the probability that the variances of two different samples are the same. The F test uses a statistic known as statistic F to test statistical hypotheses about the variances of distributions from which samples have been drawn.

[Category=Geospatial ]

*Source: esri, 18 April 2012 08:01:05, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation *

Data Quality Glossary. A free resource from GRC Data Intelligence. For comments, questions or feedback: dqglossary@grcdi.nl