1.) Seasonal affective disorder (SAD) is a type of depression
during seasons with less daylight (e.g., winter months). One
therapy for SAD is phototherapy, which is increased exposure to
light used to improve mood. A researcher tests this therapy by
exposing a sample of SAD patients to different intensities of light
(low, medium, high) in a light box, either in the morning or at
night (these are the times thought to be most effective for light
therapy). All participants rated...