Homogeneous variability within the various sample groups is required in

Walter was diagnosed with Alzheimer's disease about a year ago and is beginning to experience more notable effects. To avoid subjecting his family to a long, slow decline and to ensure his sense of dignity and self-determination, Walter wants to arrange for physician-assisted suicide. Clearly there are concerns about his current cognitive capacity to make this decision. How will Walter's capacity to seek physician-assisted suicide be determined?

a. by a doctor who will make a clinical determination b. by a judge who will make a subjective determination c. by a doctor who will make a subjective determination d. by a judge who will make a clinical determination

Tronick and colleagues asked mothers to remain expressionless as they looked at their

babies. The findings showed that an infant's looking and eye-contact with his or her parents acts as a. a sign of distress. b. a cry for help. c. an indicator of hunger. d. an invitation to interact. e. a sign of happiness.