Question: Table 6.4 reports data on 29 lakes in Florida and are stored in the file lake dat.txt on the authors web page. Assuming that you

Table 6.4 reports data on 29 lakes in Florida and are stored in the file lake dat.txt on the author’s web page. Assuming that you want to predict Y (the mean annual nitrogen concentration stored in column two) given TW (water retention time stored in column three), plot a smooth using the R function lplot. Test the hypothesis that the slope is zero using regci, first with xout=FALSE and then with xout=TRUE. Comment on what the results illustrate.

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