Chapter 8 - MAT2378 Rafal Kulik Version 2009/Nov/16 Rafal...

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Unformatted text preview: MAT2378 Rafal Kulik Version 2009/Nov/16 Rafal Kulik MAT2378 Probability and Statistics for the Natural Sciences Chapter 8 Comments These notes cover material from Chapter 8. They are almost complete . Im planning to spend one lectures on this material. Rafal Kulik 1 MAT2378 Probability and Statistics for the Natural Sciences Chapter 8 Statistical Principles of Design Rafal Kulik 2 MAT2378 Probability and Statistics for the Natural Sciences Chapter 8 Non-random selection Data: cranial capacity of skulls collected by S.G. Morton. Mr. Morton believed that the cranial capacity was linked to intelligence. Caucasian Native American Mean 87 82 SD 8 10 n 52 144 This is two independent samples problem; the P-value is very small. However, it turns out that Mr. Morton selected 25% of skulls from Inca Peruvians, who were a small-boned people. Rafal Kulik 3 MAT2378 Probability and Statistics for the Natural Sciences Chapter 8 Confounding Association is not causation Data: In a observational study...
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Chapter 8 - MAT2378 Rafal Kulik Version 2009/Nov/16 Rafal...

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