Th ree machines produce the same part. Ten different machine operators work these machines. A quality team wants to determine whether the machines are producing parts that are signifi cantly diff erent from each other in weight. Th e team devises an experimental design in which a random part is selected from each of the 10 machine operators on each machine. Th e results follow. Using alpha of 0.05, test to determine whether there is a diff erence in machines. Operator Machine 1 Machine 2 Machine 3 1 231 229 234 2 233 232 231 3 229 233 230 4 232 235 231 5 235 228 232 6 234 237 231 7 236 233 230 8 230 229 227 9 228 230 229 10 237 238 234