A study of iron deficiency among infants compared samples of infants following different feeding regimens. One...
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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 23 13.3 1.7 Formula 19 12.4 1.8 Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? Follow the steps listed below: (i) Define the parameter of interest. (ii) State the null and alternative hypotheses; use a two-sided test. (iii) State the assumptions for the standard ("pooled") two-sample t-test in this context. (iv) Compute the test statistic. Show your work clearly. State the null distribution of the test statistic. (v) Find the P-value; explain briefly how you found it. (You may use a table of the t distribution, or R.) (vi) State your conclusion: Do you reject or fail to reject Ho? What does this result tell you about the comparison between breast-feeding and formula? 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 23 13.3 1.7 Formula 19 12.4 1.8 Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? Follow the steps listed below: (i) Define the parameter of interest. (ii) State the null and alternative hypotheses; use a two-sided test. (iii) State the assumptions for the standard ("pooled") two-sample t-test in this context. (iv) Compute the test statistic. Show your work clearly. State the null distribution of the test statistic. (v) Find the P-value; explain briefly how you found it. (You may use a table of the t distribution, or R.) (vi) State your conclusion: Do you reject or fail to reject Ho? What does this result tell you about the comparison between breast-feeding and formula?
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i The parameter of interest is the mean hemoglobin level among infants ii Null hypothesis H0 There is no difference in the mean hemoglobin level betwe... View the full answer
Related Book For
Fundamental Statistics for the Behavioral Sciences
ISBN: 978-1285076911
8th Edition
Authors: David C. Howell
Posted Date:
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