11.12 Integrated circuits are manufactured on silicon wafers through a process that involves a series of steps. An experiment was carried out to study the effect on the yield of using three methods in the cleansing step (coded to maintain confidentiality). The results (stored in ) are as follows: Yield-OneWay CoffeeSales of the cats was then presented with 3 ounces of the selected food in a dish at feeding time. The researchers defined the variable to be measured as the number of ounces of food that the cat consumed within a 10-minute time interval that began when the filled dish was presented. The results for this experiment are summarized in the following table and stored in . CatFood New1 New2 Standard 38 29 31 34 35 23 38 34 38 34 20 29 19 35 32 28 37 30 Source: Data Extracted from J. Ramirez and W. Taam, “An Autologistic Model for Integrated Circuit Manufacturing,” Journal of Quality Technology, 2000, 32, pp. 254–262. a. At the 0.05 level of significance, is there evidence of a difference in the mean yield among the methods used in the cleansing steps? b. If appropriate, determine which methods differ in mean yields. c. At the 0.05 level of significance, is there evidence of a difference in the variation in yields among the different methods? d. What effect does your result in (c) have on the validity of the results in (a) and (b)?
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