9-8-09

# 9-8-09 - Ecology 330 Class Notes Variance = s^2 Standard...

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Ecology 330 – Class Notes – 9/8/09 Variance = s^2 Standard deviation = s Standard error = s / sq.root(n) Friday S group 29 quadrats N = 29 \If population is clumped, it will be harder to get an estimate of population size since we have a huge standard error as organisms are more and more clumped, so the standard error of xbar will be greater If regularly distributed, it’s easier to measure If clumped, much harder Lab reports are supposed to be very brief. DON’T have to use primary literature. Reinforce how you partition the information * Lab report should not be more than 3 pages of text o This is in addition to graphs and tables LAB FORMAT: INTRODUCTION Explicit statement of the hypothesis o WE WANT TO KNOW DENSITY, SPATIAL DISTRIBUTIONM AND IF OUR ESTIMATE OF CLUMPED SPECIES IS JUST AS GOOD AS NOT Why is this important? Just make up something These plants provide important food for some specie of animals There is a reason to be out there just need an appropriate rational Should be 1-2 paragraphs (MAXIMUM 2 PARAGRAPHS) METHODS (materials) Write methods clear enough that any one could collect Everything from using tape, random generator You don’t need to give exact area – just say Bousson forest Describe how you collected the data The methods should be sufficiently detailed that an individual outside of the field could understand it

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Describe methods for how the mean, variance, standard deviation, etc. were calculated No set length, but it needs to be sufficiently detailed RESULTS ( Your table 1 could be just the table of data he sent us o Include all data For this lab: o Include the table o 4 graphs: A graph comparing means Canadian Mayflower Perresberry Red maple o All these on y-axis Coniferous and deciduous as two categories n the x-axis (S.E or % of xbar) [y-axis] vs. . (s^2 / xbar) [on x-axis] Each figure should have a caption (Figure 1, and a title)
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9-8-09 - Ecology 330 Class Notes Variance = s^2 Standard...

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