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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, μ x . • Specific value to be tested – need a number • Must use some form of equality: “ = ”; “ ≤ ”; or “ ≥ ” s Alternative Hypothesis: • Values of μ x , if the null is not true. • Form of strict inequality: “ ≠ ”; “ > ” ; or “ < ” • The hypothesis we’re 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 don’t 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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- Spring '11
- Statistical hypothesis testing, 30 seconds, 27 seconds, 12 volts, $313, 20 oz