An article in Biotechnology Progress (2001, Vol. 17, pp. 366-368) reported on an experiment to investigate and optimize nisin extraction in aqueous two-phase systems. The nisin recovery was the...

An article in Biotechnology Progress (2001, Vol. 17, pp. 366-368) reported on an experiment to investigate and optimize nisin extraction in aqueous two-phase systems. The nisin recovery was the dependent variable (y). The two regressor variables were concentration (%) of PEG 4000 (x1) and concentration (%) of Na2SO4 (x2) :

Form the Multiple Regression Model using Matrices.

Y = ___ + ___ X1 + ___ X2

Extracted text: X1 X2 Y 1 13 11 62.8739 15 11 76.1328 3 13 13 87.4667 4 15 13 102.3236 14 12 76.1872 6 14 12 77.5287 7 14 12 76.7824 8 14 12 77.4381 9. 14 12 78.7417