3. Suppose a family stability measure was administered in four public high schools to a sample of 24 students who attend the schools. The scores below were obtained. Is there a difference in family stability between the four schools?
School A: 50, 50, 55, 60, 45, 55
School B: 55, 60, 65, 55, 70, 65
School C: 50, 65, 75, 55, 60, 65
School D: 70, 80, 65, 70, 75, 60