**Unformatted text preview: **prediction. Question 5: (a) Hostility Score = 70.5 – 2.80 × Interrupt (b) 38 . 2 , . 34 = = s SSE (c) 2602 . 6 1 . 20 300 ) 15 18 ( 8 1 1 38 . 2 447 . 2 1 . 20 2 ± = − + + × × ± =[13.840, 26.360] (d) Interrupt 5 times because SSX would be larger and the S.E. for slope and intercept would be smaller. Therefore the regression coefficient can be estimated more accurately. Question 6: (a) SALES = 70.0657+0.4216 × CREAT+0.2714 × MECH+0.745 × ABST+0.4195 × MATH =70.0657+0.4216 × 12+0.2714 × 14+0.745 × 18+0.4195 × 30=104.9195 (b) CREAT, ABST, MATH. (c) 91.13% (d) 2721 . 4 9195 . 104 048 . 2 086 . 2 9195 . 104 ± = × ± =[100.6474,109.1916]...

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