Kindly advise on how to access the latest version of rstudio that has the t.test package
t_test is a function in rstatix package
t.test is a function in stats package
As JonesYaniv says t.test is a function in stats package.
This means that t.test() is in your basic R installation. You do not need to install a separate package.
If you want t_test then you need to do
install.packages("rstatix")
library(rstatix)
the first time you want to use it.
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