A study of iron deficiency in infants compared samples of infants whose mothers chose different ways of feeding them. One group contained breast-fed infants. The children in another group were fed a standard baby formula without any iron supplements. Here are summary results on blood hemoglobin levels at 12 months of age: Group n S Breast-fed 24 15.2 2.2 Formula 32 17.2 1.8 X Part a: We want to see if the mean hemoglobin level is greater among formula-fed babies. State the hypotheses. Part b: Perform the significance test on your hypothesis. Report the test statistic and p- value. State your conclusion in terms of the issue. Part c: Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants.

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