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Unformatted text preview: Effects of soil types on crop yield Sand Clay Loam Effects of soil types on crop yield Analysis of Variance Table Response: yield Df Sum Sq Mean Sq F value Pr(>F) soil 2 99.2 49.60 4.24 0.025 Residuals 27 315.5 11.69 Analysis of Variance: partition variance Treatment effects Residual variance Total variance 100 50 SS Total = SS Treatment + SS Residual Tukey HSD test in R Tukey HSD test in R >TukeyHSD(aov(yield~soil,data=dta)) $soil diff lwr upr p adj LoamClay 2.8 0.9903777 6.5903777 0.1785489 SandClay 1.6 5.3903777 2.1903777 0.5546301 SandLoam 4.4 8.1903777 0.6096223 0.0204414 Mean Distribution of one sample Mean Uncertainty and confidence Uncertainty and confidence Standard deviation (/n) of sample means = standard error (SE) of the mean =1.96 if we know population variance: 95% CI = mean + Z* X SE if we dont know population variance: 95% CI = mean + tvalue X SE If H If H is true, repeat the study is true, repeat the study Y 1 =Y 2 y 1 y 2 n=20 n=20 n=20 t t t tdistribution Critical tvalue tvalue= Difference between two means Standard error of difference Y 1 =Y 2 y 1 y 2 n=20 n=20 n=20 t t t tdistribution Critical tvalue Difference between two means + 95%CI Difference between two means...
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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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