My Notes Ask Your Teacher 7\" + -12.25 points MBasicStat7 16. E.026. Breastfeedi

Question

My Notes Ask Your Teacher 7" + -12.25 points MBasicStat7 16. E.026. Breastfeeding mothers secrete calcium into their milk. Some of the calcium may come from their bones, so mothers may lose bone mineral. Researchers measured the percent change in mineral content of the spines of 47 mothers during three months of breastfeeding. The researchers are willing to consider these 47 women to be an SRS from the population of all nursing mothers. Here are the data, with = 2.5. (Data set may be found here.) 4.7-2.5 -4.9-2.7-0.8-5.3-8.3 -2.1 -6.8-4.3 2.2-7.8-3.-1.0-6.5-1.8-5.2-5.7 -7.0-2.2 6.5-1.0 -3.0 -3.6 -5.2-2.0 -2.1-5.6-44-33 -4.0-4.9 -4.7-3.8-5.9-2.5-0.3-6.2-6.81.7 0.3 -2.3 0.4-5.3 0.2 -2.2-5.1 (a) After sketching a stemplot, how would you describe the distribution? The distribution doesn't seem to be Normal because the stemplot has many more negative values than positive ones The distribution is exactly Normal. The distribution doesn't seem to be Normal because the average is negative The distribution seems to be quite close to Normal (b Use a 80% confidence interval to estimate the mean percent change in the population. Round your answers to two decimal places. to

Explanation / Answer

Solution:- given values :- -4.7,-2.5,-4.9,-2.7,-0.8,-5.3,-8.3,-2.1,-6.8,-4.3,2.2,-7.8,-3.1,-1.0,-6.5,-1.8,-5.2,-5.7,-7.0,-2.2,-6.5,-1.0,-3.0,-3.6,-5.2,-2.0,-2.1,-5.6,-4.4,-3.3,-4.0,-4.9,-4.7,-3.8,-5.9,-2.5,-0.3,-6.2,-6.8,1.7,0.3,-2.3,0.4,-5.3,0.2,-2.2,-5.1

mean = 3.5872, sd = 2.5, 80% confidence interval = 1.28

=>  3.5872 ± 1.28(2.5/sqrt47)

= 3.5872 ±0.4668

= ( -4.05 , -3.12) rounded

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