Why would it be important to have a true representative sample when talking about public opinion ?

What was watson’s view of the new south idea?

Who believed that the best economic system was one in which businesses compete to gain profit with minimal or no government control? a. thomas hobbes b. john locke c. adam smith d. jean-jacques rousseau

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.