In an electrolysis process, electrical current passes through a concentration of brine solution where anode and cathode are separated by a porous diaphragm. Chlorine is displaced as a gas and the remaining water/brine solution contains the caustic. The following variables are used to jointly control the process: X1 caustic (NaOH),X2 salt (NaCl), two kinds of impurities I3 and I4, and cell gases X5Cl2 and X6O2. The target values for the mean vector are 0=123456=142.66197.200.142.4098.251.30 The data for the phase I T2 control chart are in the following table. (a) Create the phase one T2 control chart using the following Minitab commands and comment on the state of control. If any vectors are out of control, omit them and re-estimate the T2 control chart. What is the one observable difference between a phase one T2 control chart and a phase one Shewhart X-bar control chart? (b) Create a phase one MEWMA control chart on the in-control data from the T2 control chart using =0.2. Does process show any steps or drifts? Stat > Control Charts > Multivariate Charts > Tsquared In the "Variables:" input box select Pb3X1 Pb3X2 Pb3I3 Pb3I4 Pb3X5 Pb3X6 with a single space between each variable name. In the "Subgroup sizes:" input box select PB3Subgp Click on the > button. On the "Parameters" tab, type in the mean vector values above with a single space between each mean value. Click the OK and OK buttons. 3