Question

A study of iron deficiency among infants compared randomly chosen samples of infants following different feeding regiments. 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 of blood hemoglobin levels at 12 months of age.

Group	sample size (n)	mean (x)	Standard deviation
Breast-fed	23	13.3	1.7
Formula	19	12.4	1.8

Is there significant evidence at the 5% level that the mean hemoglobin level is different among breast-fed and formula-fed babies? You do not need to check the conditions again but you should state your hypothesis.

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