A control valve needs to be very sensitive to the input voltage, thus generating a good output voltage. An engineer turns the control bolts to change the input voltage. In the book SN-Ratio for the Quality Evaluation published by the Japanese Standards Association (1988), a study 011 how these three factors (relative position of control bolts, control range of bolts, and input voltage) affect the sensitivity of a control valve was conducted. The factors and their levels are shown below. The data show the sensitivity of a control valve. Factor A: Relative position of control bolts: center -0.5, center, and center +0.5 Factor B: Control range of bolts: 2, 4.5, and 7 (mm) Factor C: Input voltage: 100, 120, and 150 (V). Perform an analysis of variance with ? = 0.05 to test for significant main and interaction effects. Draw conclusions.

C, 151 135 151 138 A1 B1 B2 151 135 178 171 B B2 A, 180 173 181 174 204 190 205 190 206 192 158 149 158 150 183 172 211 203 213 204 163 148 191 184 192 183 A. A A2 A2 156 148 183 168 210 204 161 145 189 182 183 170 B, B1 B2 215 202 162 148 216 203 217 205