LOS ANGELES (AP) - High-quality, universal preschool for all 4-year-olds in California would generate $2.62 in benefits for every public dollar spent, according to a new economic analysis released Tuesday by the Rand Corp. The cost-benefits study by the Santa Monica-based think tank estimated average annual costs of $1.7 billion for universal preschool would be offset in the long-term by a reduction in the high school graduation dropout rate, less juvenile crime and a more productive work force. The David and Lucile Packard Foundation, which advocates voluntary preschool for all 3- and 4-year-olds in California by 2013, funded the study....