By the 1920s the term used by Titchener for his system of psychology was ____.?

Matthew is about mid-way through puberty. In tears, he tells his camp counselor that he won't go swimming without his shirt because his breasts are enlarged. Which of the following is the best advice for Matthew?

a. "All boys experience enlargement of the breasts during puberty." b. "One out of four boys experience breast enlargement, which goes away in about a year." c. "About half of all boys experience breast enlargement, which goes away in about a year." d. "One out of a hundred boys experience breast enlargement, which goes away during adulthood."

How does a birth cohort differ from a generation?

a. Birth cohorts are those born in the same 10-year period; generations are those born in a 20-year period. b. Birth cohorts are those born in the same year; generations are born in a 20-year period. c. Birth cohorts must have shared a common experience. Generations do not have to have the common experience. d. Birth cohorts do have to share a common experience. Generations do have to share common experience.