The shear strength of an adhesive is thought to be affected by the application pressure and temperature.

Question:

The shear strength of an adhesive is thought to be affected by the application pressure and temperature. A factorial experiment is performed in which both factors are assumed to be fixed. Analyze the data and draw conclusions. Perform a test for nonadditivity.

Temperature (°F) Pressure (Ib/in?) 250 260 270 120 9.60 11.28 9.00 130 9.69 10.10 9.57 140 8.43 11.01 9.03 150 9.98 10.44 9.80