A study of iron deficiency among infants compared samples of infants following d

Question

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 Carry out a t test. Give the P-value. (Use a 0.01. Use reast Med ormula Round your value for tto three decimal places, and round your P.value to four decimal places.) o Fail to reject the null hypothesis. There is not significant evidence that the mean hemoglobin level is higher among breast-fed babies. o Fail to reject the null hypothesis. There is significant evidence that the mean hemoglobin level is higher among breast-fed babies. o Reject the null hypothesis. There is significant evidence that the mean hemoglobin level is higher among breast-fed babies. O Reject the null hypothesis. There is not significant evidence that the mean hemoglobin level is higher among breast-fed babies (b) Give a 95% confidence interval for the mean d (c) State the assumptions that your procedures in (a) and (b) require in order to be valid. o We need sample sizes greater than 40 o We need two dependent SRSs from normal populations. o We need two independent SRSs from normal populations. o We need the data to be from a skewed distribution.

Explanation / Answer

t = 1.6179

p-value = 0.0573

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

b)

c)

We need two independent SRS's from normal populations.

Given Data B Fed Formula Name mean 13.20 12.40 Sample size 22 18 Std. dev. 1.50 1.60

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