“…The design of experiments is an efficient tool for optimizing the process and product characteristics (Chowdhury & Boby, 2003;Surm et al, 2005;Wang et al, 2008;Bhuiyan, 2011;Sahoo & Sahoo, 2011;Boby, 2013;Kirshna et al, 2013;, Saha & Mandal, 2013;Sahoo, 2014). Since response surfaces need to be fitted for mean and variance of the response variable, a central composite design (CCD) is chosen for experimentation (Alam et al, 2008). The central composite designs have less number of experiments compared to 3 level full factorial experiments.…”