Challenge

In order to study the effects of insulin treatment on patients with Type II Diabetes, researchers devise a t-test, used to assess whether the means of two groups are statistically different from each other. The researchers collect the mean glucose levels for the treatment group, the ones given the insulin, and for the control group, the ones who did not receive the insulin. Using these means, the researchers try to compare both groups to see if such a treatment actually will help patients with Type II Diabetes. What type of statistics are these researchers using?