Why was the Manitoba province created? Gold had been discovered there.

The First Nations peoples wanted a province for aboriginals.

French-speaking Canadians wanted a province of their own.

The Métis wanted more say in governing.

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?