how to install the "car" package in my RStudio?

The PoEdata package is not on CRAN it is on github. The instructions in the repository are:

The package works best with RStudio. To install the "PoEdata" package, type the following script lines in the Console window of RStudio:

 install.packages("devtools")  # if not already installed
 library(devtools)
 install_git("https://github.com/ccolonescu/PoEdata")
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