Of what resources did the north have more than an 11-to-1 advantage over the south

Industrial workers

The South's economy was mainly agricultural, and mainly based on slave laborers.  The North's economy was increasingly industrial, and a sizeable percentage of the workers in the north labored in the industrial sector.  The north had more than an 11 to 1 advantage in the number of industrial workers, as well as more than a 6 to 1 advantage in the number of manufacturing plants.