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# Free response question A study of iron deficiency among infants compared samples of infants following different feeding regimens.

Free response question

A study of iron deficiency among infants compared samples of infants following different feeding regimens. One group contained breast-fed infants, while the children in another group were fed a standard baby formula without any iron supplements. Here are the results on blood hemoglobin levels at 12 months of age.

**Group****n**** s **

______________________________________________

Breast-fed2313.31.7

Formula1912.41.8

**a).**Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? Give appropriate statistical evidence to support your conclusion.

**b) .**Construct a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants. Interpret your interval in the context of this problem.