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Tham khảo tài liệu 'sustainable growth and applications in renewable energy sources part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Extraction and Optimization of Oil from Moringa Oleifera Seed as an Alternative Feedstock for the Production of Biodiesel 251 electric oven and distillation column. The moringa oleifera seeds and rice husk used in this study were collected in Bosso Estate Minna Niger State Nigeria. 3.2 The 2k factorial experimental design When several factors are of interest in an experiment a factorial method of analysis is used in order to study the effect of individual factor and its interaction with other factors to economize the experimental resources Azeez 2005 Zhang and Huang 2011 Wang et al. 2011 . In this study three factors namely temperature particle size and resident time are of interest while agitation was kept constant. This gives rise to three-factor factorial experiment the factors are tested at high and low levels. When three factors are tested at two levels as applicable in this study it is denoted by 23 factorial thus there exist eight 23 treatment combinations as shown in Table 3.1. The table indicates how the individual effect and interactions are calculated. It was assumed that A B and C are the fixed factors where there are a levels of A b levels of B and c levels of C arranged in the factorial experiment. Generally there will be abc.n total observations if there are n replicates of the complete experiment. The analysis variance is shown in Table 3.2. Treatment combination Factorial Effect I I A B C AB AC BC ABC A - - - - B - - - - Ab - - - - C - - - - Ac - - - - Bc - - - - Abc Table 3.1. Design matrix for a 23 Factorial Design Consider a three factors experiment with underlying model as shown in Equation1 before the model equation can be fitted it is important to conduct some statistical tests such as G-test T-test and F-test which involves calculation of these statistical parameters with the aid of certain formulae shown in Equations 2-4 and compare them with those given in the statistical tables. G-test is used to check if the output has the maximum .
