Merriam-Webster Collegiate Dictionary - null hypothesis
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Null hypothesis
null hypothesis
noun Date: 1935 a statistical hypothesis to be tested and accepted or rejected in favor of an alternative; specifically the hypothesis that an observed difference (as between the means of two samples) is due to chance alone and not due to a systematic cause NULL I. adjective Etymology: Anglo-French nul, literally, not any, from Latin ~us, from ne- not + ullus any; akin to Latin unus one — more at no, one Date: circa 1567 1. having no legal or binding force ; invalid 2. amounting to nothing ; nil 3. having no value ; insignificant 4. a. having no elements ~ set b. having zero as a limit ~ sequence c. of a matrix having all elements equal to zero 5. a. indicating usually by a zero reading on a scale when a given quantity (as current or voltage) is zero or when two quantities are equal — used of an instrument b. being or relating to a method of measurement in which an unknown quantity (as of electric current) is compared with a known quantity of the same kind and found equal by a ~ detector 6. of, being, or relating to zero 7. zero 1c II. noun Date: 1605 1. zero 3a(1) 2. a. a condition of a radio receiver when minimum or zero signal is received b. a minimum or zero value of an electric current or of a radio signal III. transitive verb Date: 1643 to make ~
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