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In: Statistics and Probability

A study of iron deficiency among infants compared samples of infants following different feeding regimens. One...

A study of iron deficiency among infants compared samples of infants following different feeding regimens. One group contained breast-fed infants, while the infants 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 x s
Breast-fed 24 13.1 1.5
Formula 18 12.6 1.6

(a)

Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? State H0 and Ha.

H0: μbreast-fed > μformula;   Ha: μbreast-fed = μformulaH0: μbreast-fedμformula;   Ha: μbreast-fed < μformula    H0: μbreast-fed = μformula;   Ha: μbreast-fed > μformulaH0: μbreast-fed < μformula;   Ha: μbreast-fed = μformula

Carry out a t test. Give the P-value. (Use α = 0.01. Use μbreast-fedμformula. Round your value for t to three decimal places, and round your P-value to four decimal places.)

t =
P-value =

What is your conclusion?

Reject the null hypothesis. There is not significant evidence that the mean hemoglobin level is higher among breast-fed babies.Fail to reject the null hypothesis. There is significant evidence that the mean hemoglobin level is higher among breast-fed babies.    Fail to reject the null hypothesis. There is not significant evidence that the mean hemoglobin level is higher among breast-fed babies.Reject the null hypothesis. There is significant evidence that the mean hemoglobin level is higher among breast-fed babies.

(b)

Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants. (Round your answers to three decimal places.)

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