12.74 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 rang- ing from one to nine days after harvest were exposed to Mediterranean fruit flies. Penetrability of the avocados was measured on the day of exposure, and the percent- age of the avocado fruit infested was assessed.

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

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Days after Harvest Penetrability Percentage Infected 1 0.91 30 24569 2 0.81 40 0.95 45 1.04 57 1.22 60 7 1.38 75 9 1.77 100