7. Avocados II Refer to Exercise 6. Suppose the experimenter wants to examine the relationship between the penetrability and the number of days after harvest. Does the method of linear regression discussed in this chapter provide an appropriate method of analysis? If not, what assumptions have been violated? Use the diagnostic plots provided.

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Percent Residual 96 99 95 90 80 70 60 50 40 Normal Probability Plot (response is Penetrability) . 30 20 10 5 1 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.20 0.15 0.10 0.05 0 -0.05 -0.10 Residual Versus Fits (response is Penetrability) 0.6 0.8 1.0 1.2 1.4 + 1.6 Fitted Value