For girls living in Western societies who have access to proper nutrition and medical care the menarche can be predicted to occur at the age of ____

Reynald is participating in a research study where he is watching a dot of light in a dark room. In time it appears to move. Later, he finds out that it was really stationary. This phenomenon is

a. proof that people can start seeing things if left alone for too long. b. known as the autokinetic effect. c. also a test for schizophrenia. d. widely used to make people conform.

A between-subjects experiment is one in which each subject

a. experiences each condition b. serves as his or her own control c. experiences only one of the conditions d. both a and b