12. Generate data from a bivariate normal distribution with the R command x=rmul(200). Then enter the R command y=x[,1]+x[,2]+x[,1]*x[,2]+rnorm(200), and examine the plot returned by

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12. Generate data from a bivariate normal distribution with the R command x=rmul(200).

Then enter the R command y=x[,1]+x[,2]+x[,1]*x[,2]+rnorm(200), and examine the plot returned by the R command gamplot(x,y,scale=TRUE). Compare this to the plot returned by the R command gamplotINT(x,y,scale=TRUE).