And if you have a low average blood sugar over roughly a three month time, you're going to have a lower hemoglobin A1C. So if taking the pill seems to lower folks' A1C levels more than is likely to happen due to randomly or due to other variables, well then that means that your new pill might be effective at controlling folks' diabetes. So in this situation, when we're constructing an experiment to test this, we would say that whether or not you are taking the pill, this is the explanatory variable, explanatory variable, and the thing that it is affecting, the thing that you're hoping has some response, in this case, the A1C levels are your indicator of whether it has helped controlling the blood sugar, we call that the response variable. That right over there is the response variable. So how are we actually going to conduct this experiment? Well, let's say that we have a group of folks, let's say that we have been given a group of 100 folks who need to control their diabetes. So 100 people here who need to control their diabetes.