Lipids provide much of the dietary energy in the bodies of infants and young children. There is a growing interest in the quality of the dietary lipid supply during infancy as a major determinant of growth, visual and neural development, and long-term health. The article “Essential Fat Requirements of Preterm Infants” (Amer. J. of Clinical Nutrition, 2000:

245S–250S) reported the following data on total polyunsaturated fats (%) for infants who were randomized to four different feeding regimens: breast milk, corn-oil-based formula, soy-oil-based formula, or soy-and-marine-oil-based formula:

accompanying data on folacin content for randomly selected specimens of the four leading brands of green tea.

1: 7.9 6.2 6.6 8.6 8.9 10.1 9.6 2: 5.7 7.5 9.8 6.1 8.4 3: 6.8 7.5 5.0 7.4 5.3 6.1 4: 6.4 7.1 7.9 4.5 5.0 4.0

(Data is based on “Folacin Content of Tea,” J. of the Amer.

Dietetic Assoc., 1983: 627–632.) Does this data suggest that true average folacin content is the same for all brands?

a. Carry out a test using via the P-value method.

b. Assess the plausibility of any assumptions required for your analysis in part (a).

c. Perform a multiple comparisons analysis to identify significant differences among brands.