States with the lowest concentration of online-only learners had significantly lower percentages of web-based students, according to the research. The gap, in other words, was not insignificant.

1. Louisiana: 4.1 percent
2. Massachusetts: 5.1 percent
3. Montana: 6.3 percent
4. California: 6.3 percent
5. Connecticut: 6.8 percent

Louisiana, despite having the lowest concentration of online-only college students, had a middle-of-the-road percentage in students taking some classes online. About 11 percent of Louisiana college students take at least one class on the web — 3 percent more than Iowa, which ranked among the states with the highest concentration of web-based learners.

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