The stream reaeration coefficient (r) is a necessary parameter for computing the oxygen deficit sag curve for a stream reach. The coefficient is a function of the mean stream velocity in feet per second (X1), water depth in feet (X2 ), and the water temperature in degrees Celsius (X3). Use the following data to perform a multiple linear regression analysis and evaluate its goodness of fit.

X1 X2 X3 R X1 X2 X3 r 1.4 1.3 14 2.89 3.5 2.6 25 3.58 1.7 1.3 23 4.20 3.9 2.9 19 3.06 2.3 1.5 17 4.17 4.1 3.3 13 2.41 2.5 1.6 11 3.69 4.7 3.4 24 3.30 2.5 1.8 20 3.78 5.3 3.5 26 3.05 2.8 1.9 15 3.56 6.8 3.7 23 4.18 3.2 2.3 18 3.35 6.9 3.7 21 4.08 3.3 2.5 11 2.69