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