A researcher is interested in the effect of exercise on stamina in elderly patients. The patients are randomly assigned to be in a high-exercise or low-exercise training program for eight weeks. At the end of the program, their stamina is measured by seeing how long they can walk comfortably on a treadmill. In this study, the dependent variable is.

A dependent variable is a variable that depends on the outcome of another variable whereas an independent variable doesn't depend on the outcome of another measured variable.

Now, in the question, we are told that the patients are selected randomly in a high-exercise or low-exercise training program for eight weeks.

This means that the independent variable is the exercise program as it doesn't depend on another measured variable.

However, the stamina being measured from the exercise program is the dependent variable as it depends on the exercise program results.

Read more about dependent and independent variables at; https://brainly.com/question/11969442