Agroup of scientists observe a group of college students over 4 years to determine which of their characteristics leads to weight gain. this study is an example of a retrospective study. an experimental study. a prospective study. a case-control study.

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?

How does the chairman of the federal reserve board get his job?

Lance is a member of the professional organization iceaa. he always attends its annual conferences because it provides a great opportunity for with members of the same profession. in addition to the conference, iceaa organizes for members who are seeking better employment opportunities.