OLS estimates a=1.2,b=2.1 come from n=32 observations. If X33=1, construct the 90% confidence interval for the predicted value Y^33. You can use s^n2=n21i=1nei2=1.21,Xn=0, and i=1n(XiXn)=3.7 [0.51,4.37] [1.17,5.43] [1.43,5.17] [0.23,3.97]