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Statistics Exam 2 Study Sheet.pdf
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Statistics Exam 2 Study Sheet Multiple choice, T/F, Fill-in topics: Null hypothesis The population mean is the same as that of our sample ○ There are no mean differences between the groups ○ ... In other words, our sample came from this particular population ○ This is the hypothesis we’re actually testing - Null Hypothesis Testing The Null Hypothesis Distribution ○ In the one-sample case, the NHD is the sampling distribution of the mean ○ Think of it as a map of what results are or are not likely by chance You can never prove a null hypothesis or an alternative hypothesis. You can only reject, or fail to reject the null hypothesis. Hypothesis testing: General Region of Rejection (alpha, or α) The area of the distribution in which we reject the null hypothesis (it’s a p-value!) By convention, α = .05 (sometimes .01) General steps: 1.State the null hypotheses 2.Select the statistical test and the significance level 3.Select the sample and collect the data 4.Find the region of rejection 5.Calculate the test statistic (some variable you calculate from samples to determine whether to reject a null hypothesis) 6.Make the statistical decision (and interpretation) Interpretation of results factors for significance p levels confidence intervals [Show More]
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