How can we choose one brand of sports drink over another? Perhaps knowing the number of calories and price will help. The data below show this information for the leading liquid sports drinks. One 8-ounce serving is the basic unit for both calories and cost. Brand Calories (C) Cost in dollars (D) 1. 10-K 2. All Sport 3. Daily's Ist Ade 4. Exceed 5. Gatorade 6. Hydra Fuel 7. Nautilus Plus 60 .22 70 .24 .26 34 60 70 50 .26 66 .52 60 .22 8. Powerade 67 .24 9. Snapple Snap-Up 80 .35 SOURCE: Consumer Reports, August 1993. a. What is a good summary number for typical calories per serving for these drinks? What is a good summary number for the variation in the calories per serving? b. What is a good summary number for typical cost per serving for these drinks? What is a good summary number for the variation in costs per serving? Exercises 69 c. Does the total of the calories column provide useful information? How about the total of the cost column? d. Suppose Hydra Fuel is eliminated from the list. What impact does that have on the average calories per serving? On the standard deviation of calories per serving? On the average cost per serving? On the standard deviation of the cost per serving? e. Which drink has the maximum influence on the average calories per serving? What reasoning did you use in making this choice?