Question 192892: 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 other 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 Mean S
Breast-fed 23 13.3 1.7
Formula 19 12.4 1.8
a. Is there significant evidence that the mean hemoglobin level is higher among breastfed babies? State null hypothesis and alternate hypothesis and conduct a t-test.
b. Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 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 other 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 Mean S
Breast-fed 23 13.3 1.7
Formula 19 12.4 1.8
a. Is there significant evidence that the mean hemoglobin level is higher among breastfed babies? State null hypothesis and alternate hypothesis and conduct a t-test.
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Ho: u(breast)-u
(formula) = 0
Ha: u(breast)-u(formula) > 0
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I ran a 2-Sample Ttest with a TI calculator and go the following:
test statistic: t = 1.6537..
p-value: 0.0533
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Conclusion: Since the p-value is greater than 5% fail to reject Ho.
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b. Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants.
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I ran a 2-Sample T Interval test and got the following:
(-0.2021 , 2.0021)
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Cheers,
Stan H.
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