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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 can’t usually assess directly. Example: All urban ecosystems, all Douglasfir 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 (σ/√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 landuse on stream ecosystems Urban Population Sample Rural Population Sample Key factor: Landuse (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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This note was uploaded on 01/12/2012 for the course ENVIRONMET 340 taught by Professor Dr.pan during the Winter '11 term at Portland State.
 Winter '11
 Dr.Pan

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