Lecture 31 - 211 Fall 2009

Lecture 31 - 211 Fall 2009 - s 1 IV. Inference. IV....

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Unformatted text preview: s 1 IV. Inference. IV. Inference. A. A. Confidence Intervals Confidence Intervals for for Population Mean. Population Mean. (Chapter 8 (Chapter 8) B. B. Hypothesis Tests of Population Mean Hypothesis Tests of Population Mean (Chapter 9) (Chapter 9) 1. Basics of Hypothesis Testing s Null Hypothesis: Statement about true population mean value, x . Specific value to be tested need a number Must use some form of equality: = ; ; or s Alternative Hypothesis: Values of x , if the null is not true. Form of strict inequality: ; > ; or < The hypothesis were really interested in the research hypothesis . B. Hypothesis Tests of Population Mean B. Hypothesis Tests of Population Mean s Complete Hypothesis - examples Machine filling 20 oz. bottles. Concern: bottles do not contain 20 oz. We dont want the machine to put in too much or too little: 1. Basics of Hypothesis Testing s 2 s Complete Hypothesis - examples Textbook Expenditures concern on campus that textbook costs have increased. Fall 2008 semester textbook costs have increased....
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Lecture 31 - 211 Fall 2009 - s 1 IV. Inference. IV....

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