Most online surveys fall prey to which common problem? Group of answer choices

They favor people with extreme opinions

The samples are not random

They are subject to political bias

They are too expensive.

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?

Economic growth in the united states does not affect the economies of other countries. select the best answer from the choices provided t f

How long was it from the time african american men were given the right to vote until women were given the right to vote?