Lecture 7 t test_20 - No rth C o a s tG e ne C o ns e rva...

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Initia l po o l o f wa te rs he ds  within the  No rth C o a s t G e ne   C o ns e rva tio n Are a  (NC G C A), O re g o n (n = 367) No rth C o as t G e ne  C o ns e rvatio n Are a No rth C o as t G e ne  C o ns e rvatio n Are a
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mafic volcanic flow shale and mudstone siltstone sandstone Bedrock Lithology of Study Watersheds Bedrock Lithology of Study Watersheds 81% Shale 19% Basalt
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Watershed size (n = 367) Dominant Geology (n = 183) Shale/siltstone (n = 67) Basalt (n = 86) Basalt (n= 15) Shale/siltstone (n = 15) Study Design Conductivity
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p=0.07 ns n=15 Effect of basin geology on stream conductivity
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Basalt Shale Basin geology (Categorical variable) t test: difference between two sample means C o n d u c t i v y
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Assumptions I: Normality
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Shapiro-Wilk test for normality Ho: the data are normally distributed Ha: the data are not normally distributed Test statistics W, α=0.05 P<0.05 reject Ho (with smaller W-value) P>0.05 fail to reject Ho Assumptions I: Normality
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> shapiro.test( b[b$Geology=="shale",2] ) Shapiro-Wilk normality test W = 0.7774, p-value = 0.001912 Shapiro-Wilk test for normality in R
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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.

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Lecture 7 t test_20 - No rth C o a s tG e ne C o ns e rva...

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