03352 ounces c sdweight HabitNonSmoker data NCbirths Find the standard

# 03352 ounces c sdweight habitnonsmoker data ncbirths

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The standard deviation of the weights of babies born to smoking mothers is 20.03352 ounces. (c) sd(weight ~ Habit=="NonSmoker", data = NCbirths) # Find the standard deviation of th e weights of babies born to non-smoking mothers from the NCbirths data frame ## FALSE TRUE ## 20.08900 20.29014 The standard deviation of the weights of babies born to non-smoking mothers is 20.29014 ounces. Question 7 Page 3 of 7 8/19/19, Lab 2 5.41 PM Births <- NCbirths[NCbirths\$Habit != "",] # Assign the NCbirths data of smoker/non-s moker mothers the name "Births" histogram(~weight|Habit, data=Births) # Create histograms that show the proportion o f babies' weights for smoking and non-smoking mothers Page 4 of 7 Question 8 mean(weight ~ Habit, data = Births) # Find the mean of the weights of babies from sm oking and non- smoking mothers ## NonSmoker Smoker ## NaN 116.8416 108.4225 The birth weight of babies born to smoking mothers does di ff er from those born to non- smoking mothers. As seen in the histograms, the mean (center) weight of the babies born to
smoking mothers (108.44225 ounces) is lower than those born to non-smoking mothers (116.8416 ounces). 8/19/19, Lab 2 5.41 PM Question 9 This conclusion that babies born to smoking mothers have lower weights than those born to non-smoking mothers can be extended to the population of NCbirths (specifically the babies from North Carolina state) since these conclusions were made using the NCbirths data. We do not have data of other populations to allow us to make the same conclusion.

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