Practice Quiz 2 Solution2

3 1. Refer to Case 2. The total sum of squares (SST) is a. -156 b. 234 c. 1870 d. 1974 Answer: D Solution : SST = ∑ ( y i − y ) 2 SST = 1974 SST=SUM (yi-y-bar)^2 2. Refer to Case 2. The sum of squares due to error (SSE) is a. -156 b. 234 c. 1870 d. 1974 Answer: C Solution : We know that SST = SSR + SSE 1974=104+SSE SSE=1974-104=1870 3. Refer to Case 2. The mean square error (MSE) is a. 1870 b. 13 c. 1974 d. 935 Answer: D Solution : MSE = SSE n − 2 SSE n − 2 n=4-2=2 MSE=1870/2=935 4. Refer to Case 2. The slope of the regression equation is a. -0.667 b. 0.667 c. 100 d. -100 Answer: A Solution : b 1 = ∑ ( x i − x )( y i − y ) ∑ ¿¿¿