Comparing Popular Diets Because about two-thirds of Americans are considered overweight, weight loss is big business. There are many different types of diets, but do some work better than others? Is low fat better than low carb or is some combination best? Researchers conducted a study involving four popular diets: Atkins (very low carb), Zone (40:30:30 ratio of carbs, protein, fat), LEARN (high carbohydrate, low fat), and Ornish (low fat). They randomly assigned women aged 25-50 with a body mass index (BMI) of 27-40 (overweight and obese) to one of the three diets. The 311 women who volunteered for the program were educated on their assigned diet and were observed periodically as they stayed on the diet for a year. At the end of the year, the researchers calculated the change in BMI (e. g., negative means reduction in BMI) for each woman and compared the results across the four diets. 7. Define the four parameters of interest in words using appropriate symbols. Use the following subscripts: Atkins, Zone, LEARN, Ornish. Refer to the document Defining statistics and parameters Scenario 4. (I know that this is Scenario 7, but the wording is exactly the same as it was for Scenario 4.) The explanatory variable in this study has four categories. How many pairwise comparisons are 8 possible for this data set?