Question

Refer to Exercise 12.35. Fit a single model to the data that relates y to x and x2 with separate coefficients for each of the three crops.
a. Does there appear to be a difference in slopes for the three crops?
b. Does there appear to be a difference in intercepts for the three crops?
c. Does a quadratic model appear to provide and adequate fit the data?
In exercise


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  • CreatedNovember 21, 2015
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