Refer to the hemoglobin data on 500 children with iron deficiency anemia and 500 apparently healthy children (HEMOGLOB). Select a simple random sample of size 16 from population A and an independent simple random sample of size 16 from population B. Does your sample data provide sufficient evidence to indicate that the two populations differ with respect to mean Hb value? Let . What assumptions are necessary for your procedure to be valid? Compare your results with those of your classmates.