A new compound (Rageless) has been developed to decrease aggressive behavior. Researchers have been hired to test Rageless on Sprague-Dawley laboratory rats. Twenty male Sprague-Dawley laboratory rats were chosen to test the effects of Rageless on a measure of aggressive behavior. The twenty rats first received an injection of vehicle (no drug), and then were measured for the number of aggressive behaviors they demonstrated when another unknown male rat was introduced into their individual cages. Later, the rats were given a 20mg injection of Rageless, and measured again for aggression using the same method. Lastly, the rats were given a 40mg injection of Rageless, and measured again for aggression using the same method.

Vehicle 20mg 40mg 18 19 16 33 23 17 6 7 4 27 23 17 31 27 22 16 15 13 18 16 11 28 24 21 27 23 20 14 15 12 31 29 27 42 34 31 17 13 9 26 21 6 21 20 11 29 27 18 23 21 9 34 30 11 28 26 13 24 24 14 What is the exact inferential value and is it a t- value, or an F-value, or an r-value?