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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Building 1 2 3 45 6 78910 Coke Classic 45 136 3 4 46 33 7224 11 87 6 114 56 1439 20 4 61140 24 90 100 43 542 68 3 74107 New Coke Pepsi Two-way ANOVA: Cans versus Drink, Building source D Drink Building 955573.5 6174.83 8.93 0.000 Error Total Descriptive Statistics: Cans MS P Variable Drink Mean Coke classic 102.8 64.8 73.0 2 7997.6 3998.80 5.78 0.01 ans New coke Pepsi 18 12443.7 691.32 29 76014.8