1. (2x4 = 8 points) Suppose Y has 4 possible predictors: X1, X2, X3 and X4.

a) If SSTO = 11489, SSE(X1, X2, X3) = 335, SSE(X1, X2, X4) = 990, and SSR(X1, X2) = 10493,

what is the value of SSR(X4| X1, X2)?

ource	df	Seq ss	Adj ss	F-Statistics based on Adj ss	p-value based on Adj ss
Regression	3	100.866	100.875	F1=35.14	0.000
X1	1	67.444	33.031	F2=34.52	0.000
X2	1	3.883	38.295	F3=40.02	0.000
X3	1	29.539	29.549	F4=30.88	0.000
Error	93	88.976	88.992
Total	96	189.842	189.842

3(B). Calculate SSR(X3|X1), that is the sequential sum of squares obtained by adding X3 to

a model already containing only the predictor X1. Show your work.