What is the name of the statistic that measures roughly how accurate a poll is?

What was one important effect of the renaissance’s on europen culture?

Which statement about spreading knowledge of diseases and health around the world is correct?

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?