3.3.2 Analysis of Variance
Analysis of variance (ANOVA) is a technique that use test-based variance
ratios to determine whether or not significant differences exist among
means of several groups of observations, where each group follows a
normal distribution. ANOVA also extends to t-tests used to determine
whether or not two means differ in the case where there are three or
more means.
The analysis of variance for response surface quadratic model for
response 4 (total tocopherol content; as vitamin E) was computed as
shown in Table 3.5, as it illustrates partial sum of squares of the
third type. Results were analysed and compared to know which factor or
factors are significant model terms.
Table 3.5 Analysis of Variance (ANOVA) for Response Surface Quadratic
model