Two groups of infants were used to compare the iron deficiency of two types of feeding. One group contained breast-fed infants, while the other group were fed with a standard baby formula without any...

Extracted text: Two groups of infants were used to compare the iron deficiency of two types of feeding. One group contained breast-fed infants, while the other group were fed with a standard baby formula without any iron supplement. Below are the summary results on blood hemoglobin levels at 12 months of age.


Extracted text: Group Breast-fed n S 23 13.3 107 Formula 19 12.4 108 Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? Use the p-value approach and 5% level of significance. Test of Hypothesis: Diagram: Test statistic to three decimals: p-value: Rejection rule: Conclusion in technical terms and in the words of the problem: Calculate a 95% confidence interval for the mean difference in hemoglobin levels between the two popula tions of infants.