Unformatted text preview: -left-tailed tests are for less than-two-tailed tests are for not equal to-the p-value/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 p-value is very small, such as .05 or less-conclusions in hypothesis testing-we always test the null hypothesis. The initial conclusion will always be 1.) reject the null hypothesis, or 2.) fail to reject the null hypothesis-reject the null hypothesis if the test statistic falls within the critical region-fail to reject the null hypothesis if the test statistic does not fall within the critical region-p-value method: reject the null hypothesis if the p-value is less than or equal to alpha; fail to reject if the p-value > alpha-instead of using a significance level such as .05, you could simply identify the p-value and leave the decision to the reader...
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- Fall '08
- Statistics, Null hypothesis, Hypothesis testing, Statistical hypothesis testing, Statistical power