where A is temperature, B is incubation period (h), C is sawdust
and D is agitation and these are independent variables. Significance
of each coefficient is presented in Eq. (3), determined by
Student’s t-test and p-values (Montgomery, 2001) The results
of the quadratic model for bioethanol production in the form
of analysis of variance (ANOVA) are given in Table 2. The
value of R2 and adjusted R2 was close to 0.92 and it revealed a