Abundant research, on the other hand, shows that high-quality preschools—with small class sizes, low student-teacher ratios, and robust teacher pay, training, and oversight—can have dramatic and lifelong benefits. Consider the Perry Preschool study, which in 1962 began tracking 123 African American three-year-olds from low-income families in Ypsilanti, Michigan. Throughout their lives, the 58 children randomly assigned to a top-notch preschool program have outperformed the kids who didn’t attend. At age five, more than two-thirds of the preschoolers scored 90 or better on an IQ test, compared with 28 percent of the non-preschoolers. Three-quarters of the preschoolers graduated from high school, versus 60 percent of the others. At 27, more than a quarter owned homes, compared with just 5 percent of the non-preschoolers. And by 40, nearly half of the non-preschool group had been arrested at some point for violent crimes, while less than one-third of the preschool group had.

Source: This Deep-Red State Decided to Make a Serious Investment in Preschools. It’s Paying Off Big-Time. – Mother Jones