The accompanying data on milk volume (in grams per day) were taken from the paper "Smoking During Pregnancy and Lactation and Its Effects on Breast Milk Volume" (American Journal of Clinical Nutrition [1991]: 1011-1016):
Calculate the values of the sample mean and the standard deviation.
a. Calculate the 10% trimmed mean. How does the value of the trimmed mean compare to that of the sample mean? Which would you recommend as a measure of center? Explain.
b. Compute the upper quartile, the lower quartile, and the interquartile range.
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Smoking
|
621
|
793
|
593
|
545
|
753
|
655
|
d.
|
Are there any mild or extreme outliers present in this
|
|
mothers
|
895
|
767
|
714
|
598
|
693
|
|
|
data set?
|
|
Nonsmoking
|
947
|
945
|
1086
|
1202
|
973
|
981
|
e.
|
Construct the boxplot for this data set.
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mothers 930 745 903 899 961 Compare and contrast the two samples