A 2³ factorial experiment was performed to study the yield of a chemical plant under two levels of A (pressure) B (temperature), and C (catalyst concentration).

However, because it was not possible to run a full replicate each, using the same shift of workers, it was decided to run four replicates of the experiment. The four replicates were fully confounded with the ABC effect as shown below.

Analyze fully the responses of the experiment and comment on the effectiveness of confounding in the design.

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Blocks I II III IV (1) 21.1 ab 21.2 ac 20.8 a 19.7 (1) 22.8 b 19.3 ab 24.1 21,0 ac 23.2 a 27.9 b 25.0 26.9 bc 21.4 abc 22.5 bc 21.1 abc 25.4