Table 5.

Regression coefficients and their significance for response surface model.

Term	Coefficient	Standard error	T (C/S)	p
Intercept	49.563	0.32	154.89	<0.001a
A—Glucose	1.274	0.20	6.50	0.001a
B—Yeast extract	5.495	0.20	28.04	<0.001a
C—MgCO3	2.346	0.20	11.97	<0.001a
AB	1.008	0.29	3.64	0.015b
AC	0.310	0.29	1.10	0.321
BC	2.373	0.29	8.56	<0.001a
A 2	–2.562	0.28	–8.88	<0.001a
B 2	–4.084	0.28	–14.16	<0.001a
C 2	–4.972	0.28	–17.24	<0.001a

^aSignificant at 1% level.

^bSignificant at 5% level.