Question

In: Statistics and Probability

Given are five observations for two variables, and . 1 7 10 14 19 57 54...

Given are five observations for two variables, and .

1 7 10 14 19
57 54 41 12 15

The estimated regression equation for these data is Y= 64.62-2.83x

a. Compute SSE, SST, SSR and .

(to 2 decimals)
(to 2 decimals)
(to 2 decimals)

b. Compute the coefficient of determination r2. Comment on the goodness of fit.

(to 3 decimals)

The least squares line provided a: good/bad fit ____%; of the variability in Y has been explained by the estimated regression equation (to 1 decimal).

c. Compute the sample correlation coefficient. Enter negative value as negative number.

(to 3 decimals)

Solutions

Expert Solution

X Y X * Y SSE = SST = SSR = Residual
1 57 57 1 61.79443 22.9866 449.4400 675.7105 -4.7944
7 54 378 49 44.84154 83.8774 331.2400 81.7495 9.1585
10 41 410 100 36.3651 21.4823 27.0400 0.3193 4.6349
14 12 168 196 25.06317 170.6464 566.4400 115.2795 -13.0632
19 15 285 361 10.93576 16.5180 432.6400 618.2304 4.0642
Total 51 179 1298 707 553.7303 315.5107 1806.8000 1491.2893 0.0000

SSE = 315.51

SST = 1806.80

SSR = 1491.29



Equation of regression line is


b = -2.825

a =( 179 - ( -2.8255 * 51 ) ) / 5
a = 64.62
Equation of regression line becomes



r = -0.909

Coefficient of Determination

Explained variation = 0.825* 100 = 82.5%
Unexplained variation = 1 - 0.825* 100 = 17.5%


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