Table 5.

Model coefficient estimated by multiple linear regressions.

Model term	Parameter estimate	Standard error	Computed t-value	P-value
Intercept	0.270187	0.004467	60.479	.000
X1 (CMC)	0.151937	0.004985	30.480	.000
X2 (Peptone)	0.019066	0.004985	3.825	.003
X3 (Yeast extract)	0.050437	0.004985	10.118	.000
X12	0.000199	0.008161	0.024	.981
X22	0.017596	0.008161	2.16	.056
X32	−0.045086	0.008161	−5.524	.000
X1∗X2	0.035305	0.010954	3.223	.009
X1∗X3	−0.049972	0.010954	−4.562	.001
X2∗X3	−0.005799	0.010954	−0.529	.608