An interest group's socioeconomic status is correlated with its level of success

To control for experimenter effects, the

A) participant is kept blind to the nature of the independent variable. B) participant is kept blind to the hypothesis of the study. C) researcher's direct contact and knowledge about the participants is reduced. D) researcher's direct contact with participants is increased.

What do we call the notion that what is learned first is learned best?

a. persistence b. prima facie evidence c. primacy d. primogeniture e. procognition