12.75 Avocados II Refer to Exercise 12.74. Suppose the experimenter wants to examine the relationship between the penetrability and the number of days after harvest. Does the method of linear regres- sion discussed in this chapter provide an appropriate method of analysis? If not, what assumptions have been violated? Use the MINITAB diagnostic plots provided.

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Residual Percent 0.20 0.15- 0.10- 0.05 0.00- -0.05- -0.10- 06 MINITAB diagnostic plots for Exercise 12.75 Normal Probability Plot of the Residuals (response is Petrability) 95 90 80 70 60- 50 40 30- 20 10 -0.3 -0.2 -01 0.0 Residual 0.1 0.2 03 Residuals versus the Fitted Values (response is Penetrability) 08 1.0 1.2 14 16 Fitted Value