Narrow region. The choices are picked for practicality. Where can a person go to find Geometry at a community college for PRACTICAL purposes. I can pick a slightly larger radius and find maybe 6 colleges, but beyond that, less practical. The FOUR colleges identified in the narrow region ARE the colleges (community colleges) IN THAT REGION. The sample size there is exactly 4. They are the only colleges which are important. Basically a change from driving up to 6 to 8 miles; or going over 15 miles, to attend a c.c.That's a very small sample.