Class Note for STAT 529 at OSU
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This 2 page Class Notes was uploaded by an elite notetaker on Friday February 6, 2015. The Class Notes belongs to a course at Ohio State University taught by a professor in Fall. Since its upload, it has received 24 views.
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Date Created: 02/06/15
STAT 529 Birthweight One measure of the overall health of a newborn baby is its birthweight There are many factors which affect birthweight including both genetic factors such as mother s size or mother s birthweight and environmental factors One environmental factor which is believed to lower birthweight is maternal smoking The data below present birthweights of a small number of infants with the mother s smoking status during pregnancy recorded as nonsmoker someone who has never smoked former smoker light smoker or heavy smoker Birthweight is recorded in pounds with the ounces part translated into a decimal Non Former Light Heavy 75 58 59 62 62 73 62 68 69 82 58 57 74 71 47 49 92 78 83 62 83 72 71 76 62 58 54 The question of primary concern is whether a mother s smoking reduces the mean birthweight of an infant A graphical investigation produces the boxplots below 1 non smoker 2 former smoker 3 light smoker 4 heavy smoker Birthweight l Maternal Smoking Descriptive Statistics Birthweight Mean SE Mean StDev 7586 0363 0962 Variable Smoking N 7 5 7240 0408 0913 7 8 Birthweight 1 6329 0431 1140 6013 0255 0720 2 3 4 Two issues to consider when performing an analysis First we would like to make use of all of the information in our data Second we would like to avoid performing so many analyses on our data that we nd signi cant differences where there are none
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