A heat treatment process that is used to harden steel components is examined. The process has four parameters. Which parameter(s) have the greatest impact on the hardness of steel components? Which parameter(s) have the least impact on the hardness of steel components? Why? (Please show all necessary calculations) Parameter Number Parameters Level 1 Level 2 Temperature (C) 700 900 Cooling time (s) 80 240 3 Carbon Contents (Wt%c) 1 A CO2 Concentration (%) 9 28 OA is designed as follows: Treatment Carbon COZ Condition Temperature Cooling Time Contents Concentration Results 1 IN- 1 1 140 2 - NN - 165 1 1 181 IN NN 1 198 - NN- - N N - INN 160 6 NON- - -NN 133 7 2 134 IN 240 219 10 197 11 - N- NN 178 13 14 15 - -N 174 16 2 NN - NNN 183 149 - - 192 215