12. An agronomy researcher was interested in determining the relationship between the number of wheat plants per unit area and grain production at a fixed fertility regimen. The experiment consisted of single factor (Planting Density at four levels: 20, 30, 40 and 50 plants per quarter-square meter plot) in a completely randomized design with three (3) replicate plots per planting density. The response for this experiment is yield in grams per plot. The data for this experiment appear in the following table: Planting Density 20 30 40 50 16.0 18.6 17.6 18.0 Grain 15.5 20.2 19.3 16.4 Yield (gm) 16.5 18.2 17.1 16.6

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