Answer:
A) The adjusted R² = 0.923
Explanation:
Given data
sum of squares of regression (SSR) = 210.9
Sum of squares of residuals = 15.6
Total sum of squares(SST) = 226.5
Degrees of freedom of Regression = 2
Degrees of freedom of Residuals = 17
Total number of degrees of freedom = 19
The R² is determined by


Adjusted R² is determined by
R⁻²

The degrees of freedom of residuals
n -k-1 = 17
given data k= 2 (degrees of freedom of regression = 2)
n - 2 -1 =17
n = 17 +3 =20
The Adjusted R²


on calculation, we get
R⁻² = 0.923
Final answer:-
The adjusted R² = 0.923