Thank you for your answer.
Unfortunately it didn't work. It is a csv data file and I tried your advice. I received the notification:
Error in read.table(file = file, header = header, sep = sep, quote = quote, :
object 'pruefung.csv' not found
If I insert the full pathname it says:
Error: unexpected input in "pruefung.csv <- read.csv(C:"
It just works if I click on Environment -> import dataset it shows the data in a table. Isn't it the same as if I made YOUR_CSV <- read.csv?
Since the first raw contains the names of the variables I furthermore wrote header = True.