A researcher is testing Xanax and uses a focus group where individuals are assigned to one of two groups and different doses of Xanax. He then gets the participants to learn a list of 20 numbers and...

A researcher is testing Xanax and uses a focus group where individuals are assigned to one of two groups and different doses of Xanax. He then gets the participants to learn a list of 20 numbers and three days later sees how many they can recall. In the experiment the dependent measure is simply the number of numbers recalled by each participant. What type of variable is this?