Mina — Sep 12, 2013, 10:35 AM
a <- 2 b <- -3 n <- 400 sigSq <- 0.5 set.seed(1234) x <- runif(n) y <- a + b * x + rnorm(n, sd = sqrt(sigSq)) (avgX <- mean(x))
[1] 0.4969
plot(x, y) abline(a, b, col = "purple")