# Null hypothesis acceptance and rejection, hypothesis testing

History of statistical tests[ edit ] Main article: The traditional tests of 3 or more groups are two-tailed. In stage one of the hypothesis-testing process, we formulate a hypothesis called the null hypothesis. Neyman accepted a position in the western hemisphere, breaking his partnership with Pearson and separating disputants who had occupied the same building by much of the planetary diameter.

The statistics showed an excess of boys compared to girls. To overcome any possible ambiguity in reporting the result of the test of a null hypothesis, it is best derrida essays indicate whether the test was two-sided and, if one-sided, to include the direction of the effect being tested. If sample data are not consistent with the statistical hypothesis, the hypothesis is rejected.

In the middle graph of the series of five graphs shown above, the probability of a Type I error, alpha, is approximately 0. The strength of evidence in support of a null hypothesis is measured by the P-value. To reject or not to reject the null hypothesis.

Apply the decision rule described in the analysis plan. A statistic is computed from the outcome of the experiment--the p-value is the probability of the observed outcome or something more extreme than the observed outcome, computed under the assumption that the null hypothesis is true. Note that accepting a hypothesis does not mean that you believe in it, but only that you act as wallpaper watermill it were true.

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