The following data resulted from 15 experimental runs made on 2 independent variables and a single response Y.

Y X1 X2

14.8 11.5 6.3

12.1 14.3 7.4

19 9.4 5.9

14.5 15.2 8.7

16.6 8.8 9.1

17.2 9.8 5.6

17.5 11.2 6.8

14.1 10.9 7.4

13.8 14.7 8.2

14.7 15.1 9.2

17.7 8.7 4.7

17 8.6 5.5

17.6 9.6 6.6

16.3 10.8 8.7

18.2 11.9 5.4

Fit a regression equation of the form Y = a +b1X1 + b2X2 and evaluate the ff. (item 1 to 3).

*all means in 2 decimal places. all sums and variance, max. of 4 decimal places.