Food availability at middle schools. Most schools offer a la carte food items in the...

Food availability at middle schools. Most schools offer a la carte food items in the cafeteria for students at lunch. To encourage students to eat healthfully, the U.S. Department of Agriculture (USDA) requires schools to offer nutritional food items. Two methods for identifying and quantifying food items in the a la carte line—a detailed inventory approach and a checklist approach—were compared in the Journal of School Health (Dec. 2009). Data were collected for a sample of 36 middle schools. For each school, the accompanying table gives the percentage of a la carte food items deemed healthy as determined by both methods. The researchers used a nonparametric analysis to determine if the distribution of healthy food item percentages using the inventory method is shifted above or below the distribution of healthy food item percentages using the checklist method. If no significant difference is detected, the checklist method will be recommended because it is simpler and requires fewer resources. A MINITAB analysis of the difference (inventory value minus checklist value) is displayed below. Use this printout to conduct the appropriate analysis at a = .05. Which method do you recommend?