The birth weights (in grams) are given for babies born to 22 mothers who smoked during their pregnancy and to 35 mothers who did not smoke. Seven pounds is about 3200 grams. (Source: Smoking Mothers, Holcomb 2006, accessed via StatCrunch. Owner: kupresanin99)

a. Compare the means and standard deviations in context.

b. Remove the outlier of 896 grams for the smoking mothers, make the comparison again, and comment on the effect of removing the outlier.

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es 08 0 04 12 268 00 20 7 4 64 12 N37 2 868 253332 18 12 8202