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Unformatted text preview: lefttailed tests are for less thantwotailed tests are for not equal tothe pvalue/probability value is the probability of getting a value of the test statistic that is at least as extreme as the one representing the sample data, assuming that the null hypothesis is true. The null hypothesis is rejected if the pvalue is very small, such as .05 or lessconclusions in hypothesis testingwe always test the null hypothesis. The initial conclusion will always be 1.) reject the null hypothesis, or 2.) fail to reject the null hypothesisreject the null hypothesis if the test statistic falls within the critical regionfail to reject the null hypothesis if the test statistic does not fall within the critical regionpvalue method: reject the null hypothesis if the pvalue is less than or equal to alpha; fail to reject if the pvalue > alphainstead of using a significance level such as .05, you could simply identify the pvalue and leave the decision to the reader...
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 Fall '08
 Sapko
 Statistics

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