7.4. Consider the data from the first replicate of Problem 6.1. Suppose that these observations could not all be run using the same bar stock. Set up a design to run these observations in two blocks of four observations each with ABC confounded. Analyze the data. [6.1. An engineer is interested in the effects of cutting speed (A), tool geometry (B), and cutting angle (C) on the life (in hours) of a machine tool. Two levels of each factor are chosen, and three replicates of a 2 factorial design are run. The results are as follows: ) Treatment Combination Replicate II B 1 (1) 22 25 31 43 a 29 32 35 b 34 50 ab 55 47 46 + 1 + 1 + 1 + 1 TL + + + + 44 45 38 ac 37 + + + + 40 60 36 54 bc 50 abc 39 41 47