1. 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