Lecture 6 t-test_1 - Hypothesis testing Po pula tio n ve rs...

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Unformatted text preview: Hypothesis testing Po pula tio n ve rs us s a m ple Po pula tio n ve rs us s a m ple Sample : The part of the population we actually examine and for which we do have data. How well the sample represents the population depends on the sample design. A s tatistic is a number describing a characteristic of a s ample. Population : The entire group of individuals in which we are interested but cant usually assess directly. Example: All urban ecosystems, all Douglas-fir trees in Oregon, all fish A p arameter is a number describing a characteristic of the p opulation. Population Sample Summarize a Normal Distribution (mean + SD) Uncertainty and confidence Uncertainty and confidence Standard deviation (/n) of sample means = standard error (SE) of the mean Comparing two sample means A B Response variable Urb a n g ro wth bo unda ry Effects of land-use on stream ecosystems Urban Population Sample Rural Population Sample Key factor: Land-use (urbanization) Mean u Mean r H o : Mean u = Mean r Water quality as response Urban Population Rural Population If Mean u = Mean r If Mean u Mean r Urban Population Rural Population Mean u Mean r Mean u = Mean r Hypothesis testing...
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Lecture 6 t-test_1 - Hypothesis testing Po pula tio n ve rs...

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