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A study of iron deficiency among infants compared randomly chosen samples of infants following different feeding...

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

Construct a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants. Show the 4 steps as you answer the question.

Math   Statistics-And-Probability   
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