Question

A group of college students believes that herbal tea has remarkable restorative powers. To test their theory they make weekly visits to a local nursing home, visiting with residents, talking with them, and serving them herbal tea. The residents are evaluated by a trained therapist at the beginning of the study for general health and mental state. After several months of the visits, the residents are reevaluated by the therapist and it is found that many of the residents are more cheerful and healthy. This is A) an observational study. B) an experiment, but not a double blind experiment. C) a double blind experiment. D) a block design.

Answer 1