LabII.1

LabII.1 - Biological Statistics I Biometry 3020 Natural...

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Biological Statistics I Biometry 3020 / Natural Resources 4130 / Statistical Science 3200 Lab 1 Name: Section: Date: This lab is meant to facilitate understanding the difference between estimating the mean of Y for a particular X and a new Y for a particular X. We shall do this by using formulas for the variance from the book as well as the standard predict() output from Splus/R. We shall use the sparrow wing data to compute h Y ˆ and ) ( ˆ new h Y with associated variances and standard errors. sparrow = data.frame(   age.days=c(3,4,5,6,8,9,10,11,12,14,15,16,17),   wing.length=     c(1.4,1.5,2.2,2.4,3.1,3.2,3.2,       3.9,4.1,4.7,4.5,5.2,5.0)) 1. First plot the data: plot(wing.length~age.days,data=sparrow) 2. Use the following command, as we did last semester, to generate predictions and standard errors and plot lines showing 95% confidence intervals about the mean line.

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LabII.1 - Biological Statistics I Biometry 3020 Natural...

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