null hypothesis

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Related to null hypotheses: Alternative hypothesis, P value

null hypothesis

[′nəl hī′päth·ə·səs]
(statistics)
The hypothesis that there is no validity to the specific claim that two variations (treatments) of the same thing can be distinguished by a specific procedure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

null hypothesis

a working hypothesis which states that there will be no statistically significant difference between the EXPERIMENTAL GROUP and CONTROL GROUP.

When an experiment is set up, or observational data collected, this is designed to test a HYPOTHESIS, or theory which has been developed from previous work. This is the EXPERIMENTAL HYPOTHESIS, and it states what the expected difference is between the groups if the theory is correct. The converse hypothesis is also conventionally stated: this is the null hypothesis, that predictions from the theory are incorrect, and there is no difference between the groups in the VARIABLE investigated. See also INDEPENDENT VARIABLE, DEPENDENT VARIABLE.

Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
References in periodicals archive ?
Two null hypotheses were made related to this objective.
The implication is that any true null hypothesis will be rejected with probability [alpha] (if the test has been formulated correctly), so that collections of [N.sub.0] hypothesis tests whose null hypotheses are all true will exhibit, on average, [alpha] [H.sub.0] erroneous rejections.
Specifically, assumptions regarding the null hypotheses for the firms with minority win probabilities have a nontrivial impact on the analysis.
Besides, the appropriated notation for the null hypotheses 2 and 4 are
The forecast fails to be unbiased if we reject (i) the null hypotheses that [alpha] = 0 and [beta] = 1 individually and/or jointly, and (ii) the null hypothesis that [alpha]' = 0.
of a noninformative hypothesis test is a test of null hypotheses such as
The null hypotheses are: [Y.sub.t] will granger--cause [OC.sub.t] if [[mu].sub.t] [not equal to] 0.
* Null hypotheses of a unit root is rejected at 5% significance level or less.
The three null hypotheses were tested using chi-square analyses (Witte, 1989).
The null hypotheses of unit roots in the first differences of the married female labor force participation rate, the married female birth rate, and mean real female income are all rejected at the one-percent level.
To explore the purpose of this study in a systematic way, the following null hypotheses were tested: