Ecology weeks 1 and 2
Ecology weeks 1 and 2 BIOL-3034
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This 1 page Class Notes was uploaded by Daniella Heussner on Monday January 25, 2016. The Class Notes belongs to BIOL-3034 at Oklahoma State University taught by Dr. Steets in Spring 2016. Since its upload, it has received 16 views. For similar materials see Ecology in Biology at Oklahoma State University.
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Date Created: 01/25/16
An ecological system consists of a group of organisms that have regular interaction or dependence upon each other Hierarchy of ecological systems Individual ltPopulation ltCommunity lt Ecosystem lt Biosphere Lecture 2 Scientific Method Manipulative experiments Alter and measure response in l or more variables Create artificial variation Can be replicated Natural experiments Natural variation Variables are not altered Hard to replicate Ways to characterize data Mode the most replicated answer Median Value at which half of the observations are greater and half are lesser Mean average Range Max minus minimum Variance spread about the mean Standard deviation square root of variance Types of hypothesis Null hypothesis H0 A statement of no effect no difference no patternquot Alternative hypothesis H1 Tests of significance Test statistic your calculated value using all of the data When test statistic is very large far from 0 reject the H0 When test stat is very small close to zero fail to reject the H0 Pvalue The probability that observed or more extreme differences would have been found if the null hypothesis were true If pvalue is small plt005 you reject the H0 If pvalue is large pgt005 you fail to reject the H0 Critical value The value that a test statistic must exceed in order for the null hypothesis to be rejected
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