1. In a set of observations (x1,y1),. . ., (xmyn), let yl, . . .,y,, be a sequence of i.i.d. observation where y,- N N (g(x,-), 02), for 1' = 1,2,. . ., n. In other words we can write yi:g(xi)+i' 21121"'Ini where e,- i.i.d. N(0,o'2), 1': 1,2,. . .,n and _ f30+f31x ifx