Question

The Coca- Cola Company introduced New Coke in 1985. Within three months of this introduction, negative consumer reaction forced Coca-Cola to reintroduce the original formula of Coke as Coca- Cola Classic. Suppose that two years later, in 1987, a marketing research firm in Chicago compared the sales of Coca- Cola Classic, New Coke, and Pepsi in public building vending machines. To do this, the marketing research firm randomly selected 10 public buildings in Chicago having both a Coke machine (selling Coke Classic and New Coke) and a Pepsi machine.
The data—in number of cans sold over a given period of time—and a MINITAB randomized block ANOVA of the data are given in Figure. Using the computer output:
a. Test the null hypothesis H0 that no differences exist between the mean sales of Coca- Cola Classic, New Coke, and Pepsi in Chicago public building vending machines. Set α = .05.
b. Make pairwise comparisons of the mean sales of Coca-Cola Classic, New Coke, and Pepsi in Chicago public building vending machines by using Tukey simultaneous 95 percent confidence intervals.
c. By the mid- 1990s the Coca-Cola Company had discontinued making New Coke and had re-turned to making only its original product. Is there evidence in the 1987 study that this might happen? Explain your answer.


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  • CreatedMay 28, 2015
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