Case2:A quality inspector at Morgan Manufacturing Co. inspects part dimensions for a machining operation. Specifications require the mean part diameter to be 2 inches. If a sample leads the quality control inspector to believe that part diameters are too large or too small, the machine will be shut down and readjusted. State the hypothesis test that could be used to determine whether or not the machine should be shut down. 摩根制造公司(Morgan Manufacturing Co.)的一名质检员负责检查机加工工序的零件尺寸。规格要求零件的平均直径为2英寸,如果样品导致品管检验员认为零件直径过大或过小,机器将被关闭并重新调整。质检人员每次检验时设定的原假设和备择假设是什么?(目标批次零件的平均直径为μ)