Avocado Research Movement of avocadosinto the United

Chapter 12, Problem 69

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Avocado Research Movement of avocadosinto the United States from certain areas isprohibited because of the possibility of bringing fruitflies into the country with the avocado shipments. However,certain avocado varieties supposedly are resistant tofruit 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 harvestwere exposed to Mediterranean fruit flies. Penetrabilityof the avocados was measured on the day of exposure,and the percentage of the avocado fruit infested wasassessed.Days after Harvest Penetrability Percentage Infected1 .91 302 .81 404 .95 455 1.04 576 1.22 607 1.38 759 1.77 100Use the MINITAB printout of the regression of percentageinfected ( y) on days after harvest (x) to analyzethe relationship between these two variables. Explainall pertinent parts of the printout and interpret theresults of any tests.MINITAB output for Exercise 12.69 Regression Analysis: Percent versus xThe regression equation isPercent = 18.4 + 8.18 xPredictor Coef SE Coef T PConstant 18.427 5.110 3.61 0.015x 8.1768 0.9285 8.81 0.000S = 6.35552 R-Sq = 93.9% R-Sq(adj) = 92.7%Analysis of VarianceSource DF SS MS F PRegression 1 3132.9 3132.9 77.56 0.000Residual Error 5 202.0 40.4Total 6 3334.9