What is one method a psychologist could use to avoid self-fulfilling prophecies in their research?

Which of these was not a key difference between northern and southern states at the constitutional convention? wanting to protect states’ interests vs. a government with strict rules having more, larger cities vs. having fewer, smaller cities wanting to protect agriculture vs. protect industries having many enslaved people vs. using less enslaved labor

What are policymakers trying to do by using the media to deliver specific messages to citizens?

What caused the settlement of more african americans in the mississippi alluvial plain region then in the ozark mountains region?