Refer to the red blood cell data on 1050 subjects (RBCDATA). Suppose that you are a statistical consultant to a medical researcher who is interested in learning something about the relationship between blood folate concentrations in adult females and the quality of their diet.

The researcher has available three populations of subjects: those whose diet quality is rated as good, those whose diets are fair, and those with poor diets. For each subject there is also available her red blood cell (RBC) folate value (in mg=liter of red cells). Draw a simple random sample of size 10 from each population and determine whether the researcher can conclude that the three populations differ with respect to mean RBC folate value. Use Tukey’s test to make all possible comparisons. Let a ¼ :05 and find the p value for each test. Compare your results with those of your classmates.