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Research hypothesis: There is a significant difference in the rates of involvement in marijuana use between poor people and affluent people.
Alternative hypothesis: Poor people have a higher rate of involvement in marijuana use compared to affluent people.
Null hypothesis: There is no significant difference in the rates of involvement in marijuana use between poor people and affluent people.
To test these hypotheses, you would need to conduct interviews with 100 adults outside of Grand Central station and ask them about their involvement in marijuana use and their perceived social class.