I am mapping the accessibility of job opportunities in Detroit for those who rely on public transportation. To do this, I need to create a circular buffer surrounding each bus stop with a radius extending out a mile in every direction. One mile represents the average time it takes a person to walk 20 minutes, a value chosen based on empirical research that an average person walks 4.5 feet a second (or 3 miles per hour).
In ArcGIS 3.0, I only see a "Variable Distance Buffer" tool under Vector--> Geoprocessing Tools. (See pic below). But these fields are not intuitive to me, even after clicking the help button. Where and how do I specify 1 mile for the radius measurement to extend out from the point in all directions? P.S. I should add I do not yet know python, so looking for alternative solutions.