This data file is intended for use with the Two-Level Factorial tutorial. The data you will now analyze comes from Douglas Montgomery’s textbook, Design and Analysis of Experiments, published by John Wiley and Sons, New York. A waferboard manufacturer must immediately reduce the concentration of formaldehyde used as a processing aid for a filtration operation, or they will be shut down by regulatory officials. 35 35 72 72 72 72 72 0 0 0 0 0 1 -1 -1 0 0 0 0 0 1 -1 -1 24 15 2 30 45 24 10 2 30 43 35 15 2 30 104 24 10 4 30 75 24 15 4 30 70 35 10 4 30 86 35 10 2 15 71 24 15 2 15 48 24 15 4 15 80 35 10 2 30 100 35 15 4 15 65 24 10 2 15 45 35 15 2 15 65 35 10 4 15 60 35 15 4 30 96 24 10 4 15 68