Comparison of two energy drinks. Consider the following study to compare two popular energy drinks. For each subject, a coin was flipped to determine which drink to rate first. Each drink was rated on a 0 to 100 scale, with 100 being the highest rating.
(a) Inspect the data. Is there a tendency for these subjects to prefer one of the two energy drinks?
(b) Use the matched pairs t test of Chapter 7 (page 384) to compare the two drinks.
(c) Use the Wilcoxon signed rank test to compare the two drinks.
(d) Write a summary of your results and explain why the two tests give different conclusions.