In an effort to overcome some of the limitations of traditional developmental designs, Dr. Francisco conducted several similar cross-sectional studies at varying times. Dr. Francisco used the __________ design

We have had scientific evidence of the effectiveness of amphetamines in enhancing athletic performance for about 50 years

Indicate whether the statement is true or false

A group of people born during the same period in historical time is a(n):

a) cohort. b) peer group. c) developmental group. d) age group.