From a field experiment the data on yield of wheat in qtls(Y), Nitrogen contents in these soil at the time of sowing (X1) and Nitrogen applied (X2), are recorded as follows Y 16.2 31.5 30.6 39.4 12.9 25 31.9 37.5 18.9 36.1 38 40.3 X1 69.6 69.6 69.9 69.9 81.5 81.5 81.5 81.5 95.9 95.9 95.9 95.9 X1 0 40 60 80 0 40 60 80 0 40 60 80 Fit a multiple linear regression equation of Y on X1 and X2 and calculate partial and multiple correlation coefficients from the above data and test for their significance​