Caption: Independent Groups
Text: Independent groups are literally different from one another, e.g., if we were to comparie BMI in a group of smokers to BMI in a group of non-smokers, or if we were to assign one group to take an experimental drug while a separate comparison group took an inactive placebo.

In contrast, dependent groups are matched or paired in some way. For example, if we enrolled a group of patients with high blood pressure and compared their systolic blood pressure measurements before and after treatment, this would be a paired comparison.