1. In a set of observations (x1,y1),. . ., (xmyn), let y1,. . .,yn be a sequence of i.i.d. observation where y;- N N ( g(xg), :72), for 1' = 1,2, . . . , n. In other words we can write yi = g(xi) +61) i: 1121- "In! Lid. whereel- ~ N(0,0'2), i=1,2,...,n and _ o+f31x ifx