A router is used to cut locating notches on a printed circuit board.The vibration level at the surface of the board as it is cut is considered to be a major source of dimensional variation in the notches.Two factors are thought to influence vibration:bit size (A) and cutting speed (B).Two bit sizes (1/16 and 1/8 inch) and two speeds (40 and 90 rpm) are selected, and four boards are cut at each set of conditions shown below.The response variable is vibration measured as a resultant vector of three accelerometers (x, y, and z) on each test circuit board.

\fResponse: Vibration ANOVA for Selected Factorial Model Analysis of variance table [Partial sum of squares] Sum of Mean F Source Squares DF Square Value Prob > F Model 1638.11 3 546.04 91.36