Avocados II Refer to Exercise 12.69. Suppose the experimenter wants to examine the r...

Avocados II Refer to Exercise 12.69. 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.

Reference:

Avocado Research Movement of avocados into the United States from certain areas is prohibited because of the possibility of bringing fruit flies into the country with the avocado shipments. However, certain avocado varieties supposedly are resistant to fruit fly infestation before they soften as a result of ripening. The data in the table resulted from an experiment in which avocados ranging from 1 to 9 days after harvest were exposed to Mediterranean fruit flies. Penetrability of the avocados was measured on the day of exposure, and the percentage of the avocado fruit infested was assessed.

Use the MINITAB printout of the regression of percentage infected ( y) on days after harvest (x) to analyse the relationship between these two variables. Explain all pertinent parts of the printout and interpret the results of any tests.