=+28. The article “Effect of Cutting Conditions on Tool Performance in CBN Hard Turning” (J. of Manuf.

Processes, 2005: 10–16) reported the accompanying data, from a 23 design, on cutting speed (m/s), feed

(mm/rev), depth of cut (mm), and tool life (min).

Perform an ANOVA to investigate two-factor interactions and main effects.

Obs Cut spd Feed Cut Depth Life 1 1.21 0.061 0.102 27.5 2 1.21 0.168 0.102 26.5 3 1.21 0.061 0.203 27.0 4 1.21 0.168 0.203 25.0 5 3.05 0.061 0.102 8.0 6 3.05 0.168 0.102 5.0 7 3.05 0.061 0.203 7.0 8 3.05 0.168 0.203 3.5