Question 3.65

3.65 I’ll have a Mocha Light.

Here’s the opening of a press release: “Starbucks Corp. on Monday said it would roll out a line of blended coffee drinks intended to tap into the growing popularity of reduced-calorie and reduced-fat menu choices for Americans.” You wonder if Starbucks customers like the new “Mocha Frappuccino Light” as well as the regular version of this drink.

  1. Describe a matched pairs design to answer this question. Be sure to include proper blinding of your subjects.
  2. You have 30 regular Starbucks customers on hand. Use software or Table B at line 151 to do the randomization that your design requires.

3.65

(a) Each subject will taste and rate each drink without being told or shown which are the regular and light versions. Half of the subjects will be given the regular version first, then the light version; the other half will be given the samples in reverse order. (b) Using labels 01–30 and line 151, the subjects for the first treatment are 03, 29, 26, 01, 12, 11, 21, 30, 09, 23, 07, 27, 20, 06, 05.