Question: A researcher tests 10 individuals before and after an experimental procedure.The results are shown below. How many degrees of freedom are there?
Before After
10.4 10.8
12.6 12.1
11.2 12.1
10.9 11.4
14.3 13.9
13.2 13.5
9.7 10.9
11.5 11.5
10.8 10.4
13.1 12.5