Go to https://rstudio.scf.oregonstate.edu/. If you get a complaint about the security certificate, ignore it for now. Log in and copy and paste:
install.packages(c("Sleuth2", "ggplot2"))
# you might be asked to choose a mirror, pick 5
library(Sleuth2)
library(ggplot2)
qplot(Sex, Salary, data = case0102, geom = "boxplot")