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3-8 - Confidence Interval – 2 SIDED Don’t give 2-sided...

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March 7, 2011 We can possibly resubmit exam the take home part. Due Friday . Take Home Exam General If there is output but not verbiage then there is no points. We have to write down. Less output is better. Only give output that is very important. Problem 1 Be sure to specify your null and alternative hypothesis explicitly. Paired test should have null and alternative should be different. Everything should have a separate hypothesis. Be careful to report what you do. Dependencies: Paired Independent : Pooled Problem 2 Don’t give a test with a p-value. Give a confidence internal and say what it means. You can do the p-test but don’t have to give it, just do it for yourself. USE the actual 95% confidence internal. USE the interval to do the test. If we are giving the p-value we are doing the wrong thing. Majority of people talked more. Alpha & p-value do not test statistical significance.
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Unformatted text preview: Confidence Interval – 2 SIDED Don’t give 2-sided p-values for a one-sided test. Classwork When Y is transformed, it: Changes equal variance Changes distribution Changes shape We can look at measure of variability vs measure of mean. In essence, equal variance and distribution are tied together. When X is transformed, it only effects: the shape of the curve, nothing else. If red line sits on top of blue line, it is not statistically significant. If there is curvature on the dotted line, it means we have to transform the variable . Parameter estimates are for predicting (weights). Since there is log on Y even though there isn’t log in all of the X’s, the answer to predict will still be in terms of Log Y. In a residual plot, we should see randomness and if there is a pattern then something is not right....
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