*13. Parents of 14 entering first graders eagerly volunteer their children for the tryout of a new experimental reading program announced at a PTA meeting. To obtain an \equivalent"

group for comparison purposes, each experimental child is matched with a child in the regular program on the basis of sex and reading-readiness scores from kindergarten.

At the end of the first grade, a dependent-samples t test shows those in the experimental program to have significantly higher reading achievement scores than their matched counterparts in the regular program.