Homework Answers
8.a.
| x | y | x^2 | xy | y^2 |
| 3 | 9 | 9 | 27 | 81 |
| 4 | 8 | 16 | 32 | 64 |
| 6 | 7 | 36 | 42 | 49 |
| 7 | 5 | 49 | 35 | 25 |
b. 
Sum of X = 20
Sum of Y = 29
Mean X = 5
Mean Y = 7.25
Sum of squares (SSX) = 10
Sum of products (SP) = -9
Regression Equation = ŷ = bX + a
b = SP/SSX = -9/10 =
-0.9
a = MY - bMX = 7.25 -
(-0.9*5) = 11.75
ŷ = -0.9X + 11.75
| c. We will find correlation using excel formula |
| CORREL(L6:L9,M6:M9)=-0.9621 |
| d. For x=10, ŷ = (-0.9*10)+ 11.75=2.75 |
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