Manufacturing in Nevada isn't healthy, and the logistics industry isn't doing much better, finds a national study by researchers at Ball State University.The researchers at the Indiana school's Center for Business and Economic Research give a grade of "F" to the manufacturing environment in Nevada and give the logistics environment a "D."Nevada officials say, however, Gov. Brian Sandoval's economic development plan addresses in depth the problems spotlighted by the Ball State study.Manufacturing accounts for 2.6 percent of the Nevada economy.A major stumbling block for both sectors in Nevada is the quality of its workforce, the new study found."No factor matters …