The article Effect of Manual Defoliation on Pole Bean
Chapter 0, Problem 14.29(choose chapter or problem)
The article Effect of Manual Defoliation on Pole Bean Yield (Journal of Economic Entomology [1984]: 10191023) used a quadratic regression model to describe the relationship between y yield (kg/plot) and x defoliation level (a proportion between 0 and 1). The estimated regression equation based on n 24 was where x1 x and x2 x2 . The article also reported that R2 for this model was .902. Does the quadratic model specify a useful relationship between y and x? Carry out the appropriate test using a .01 level of significance.
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