A 2³ factorial experiment was carried out on methods of cultivating cauliflower. The factors were 1. Fertilizers applied in spring or summer 2. Spraying or nonspraying 3. Irrigation or lack of irrigation The experiment was performed twice, and the percentage of poor quality cauliflower was observed in each case. Analyze the data fully, stating your conclusions clearly.  Suggest the treatment combinations that are significant.

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Irrigated Nonirrigated Spring Summer Replicate Spray Nonspray Spray Nonspray 1 20.5 28.7 26.2 37.5 212 19.7 31.3 29.9 35 24.8 21.8 19.7 29.4 26.5 26 27.0 26.6