Dr. Lopez conducts experimental laboratory research on attraction, but also conducts field studies on the way in which attractiveness influences choices of real-world romantic partners. Dr. Lopez is taking a ________ approach to research

When researchers compared infants who were in daycare for varying hours each week, they found that:

a. day care has no significant effect on the security of a child's attachment. b. even a few hours of day care per week significantly impacts the security of a child's attachment. c. thirty or more hours per week in day care decreases secure attachment. d. fifteen or more hours per week in day care decreases secure attachment.

Episodes of mania are characterized by

a. suicidal thoughts. b. extreme sadness. c. crying spells. d. strong feelings of guilt. e. intense euphoria.