Marcella Is Interested in Studying the Physical Development of Girls

Multiple Choice

Marcella is interested in studying the physical development of girls between 7 and 10 years of age. It is impractical to think that she could study every such girl in the country, so instead she selects a smaller group of girls in this age range to study. The group that Marcella studies is a(n) ________, and the larger group that they represent is a(n) ________.

A) ​population; sample
B) ​out-group; in-group
C) ​in-group; out-group
D) ​sample; population