Q4. An engineer is interested in the effects and interaction of Velocity (X1) and Load (X2) on the rate of wear (Y) of a shaft in a machine component. He is able to pick a low and a high value for each input variable and setup the following Table of contrast. Complete the Table and Provide the main effect and interaction between the two variables Expt. Coded Variables Results Number XI X2 Y 15 2 12 3 17 4 10