1. An article in Quality Progress [May 2011. pp. 42-45} describes the use of factorial experiments to improve a silver powder production process. This product is used in conductive pastes to manufacture a wide variety of products ranging from silicon wafers to elastic membrane switches. We consider powder density [gfcm2llgfcm2] as the response variable and critical characteristics of this product. The data is shown below. Stir Ammoniu Rate Temperatur Densi m {9'3} {RPM} 6 {T} W 2 166 ' 6 "14.66 2 166 6 " 15.16 so 166 e 15.12 so 166 6 12.46 2 156 6 2.54 2 156 6 6.66 so 156 6 12.46 so 156 6 "12.62" 2 166 46 "16.65 2 166 46 1266 so 166 46 12.65 so 166 46 15.96 2 156 46 ans 2 156 46 6.64 so 156 46 "14.96 so 156 46 "14.66 Assume Ammonium. Stir Rate, and Temperature are factors. each with two levels, and the design is replicated twice. a} Write the model equation for a full factorial model b} TWhat factors are deemed significant, using 09:.[15 as a guide. Report final pvalues of signicant factors [and interaction plots if necessary}