PSET3

The variable birthweight measures the infant’s birth weight in grams.
The variable smoker is a binary variable equal to 1 if the mother smoked during pregnancy and 0 otherwise. —

How many variables are stored in bwdata?

bwdata <- read.csv("bw_smoking.csv")
length(names(bwdata))

## [1] 12

library(tinytex)

What is the average birth weights for the entire sample?

mean(bwdata$birthweight)

## [1] 3382.934

What is the variance of birth weight for the entire sample?

var(bwdata$birthweight) 

## [1] 350656.9

Create a scatterplot of birthweigth (on the y-axis) and smoker (on the x-axis).

plot(x=bwdata$birthweight, y = factor(bwdata$smoker))