In a regression analysis involving 30 observations, the following estimated regression equation was obtained. = XXXXXXXXXX x 1 - 2.3 x 2 + 7.6 x 3 = 2.7 x 4 The values of SST and SSR are 1805 and...

In a regression analysis involving 30 observations, the following estimated regression equation was obtained.

 = 17.6 + 3.8x
₁ - 2.3x
₂ + 7.6x
₃ = 2.7x
₄

The values of SST and SSR are 1805 and 1760, respectively.

a. ComputeR
².

b. Compute . R
²
_a

c. Comment on the goodness of fit.