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y Bookmarks People Window Help x O Aplia: Student Question uiz action takeQuiz&quiz; probGuidaONAPC 70000&cto; wendy ahrendsen-oo rviet/quiz Graded Assignment Back to Assignment Due Monday 04.24.17 at 11:45 PM Attempts: 1 Keep the Highest: 2/4 4. Eoc Practice problem a4 Aa Aa a Breastfeeding sometimes results in a temporary loss of bone mass, as calcium is depleted in the mother's body to provide for milk production. The paper Bone Mass Is Recovered from Lactation to Postweaning in Adolescent Mothers with Low Calcium Intakes" (American Journal of clinical Nutrition t2004]: 1322-1326) gave the accompanying data on total body bone mineral content (g) for a sample of mothers both during breast feeding (B) and in the postweaning period (P). Use a 95% confidence interval to estimate the difference in mean total body bone mineral content during postweaning and during breast feeding. Bone Mineral Content Bone Mineral Content Subject During Breast Feeding (B) in the Postweaning Period (P) 1928 2126 2549 2895 1924 1942 1628 1750 2175 2184 2144 2164 2621 1843 2541 Because the answers to the four key questions (QSTN) are estimation, sample data, one numerical variable, and two paired samples consider a paired t confidence interval for a difference in population means.Explanation / Answer
Calculating mean and standard deviation
Observed difference (Sample 1 - Sample 2): -102.7
Equal Variances
Pooled Standard Deviation: sqrt(s1^2 +s2^2)/2) = 401.1036 {as n1 =n2}
Pooled DF: = n1+n2 - 2= 18
95% Confidence Interval for the Difference
t0.025 = 2.101
(xbar - t*s_pooled*sqrt(1/n1+1/n2),((xbar +t*s_pooled*sqrt(1/n1+1/n2))
( -479.5573 , 274.1573 )
since 0 is the interval , the bone mineral content during breast feeding is not different to that during post wearing period
Sample 1 10 2217.8 395.9985 125.226 Sample 2 10 2320.5 406.1445 128.434Related Questions
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