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D The following maps depict the concentration of two narcotics recovered from several municipal wastewater systems across Oregon state in 2008 (left map: methamphetamine; right

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D The following maps depict the concentration of two narcotics recovered from several municipal wastewater systems across Oregon state in 2008 (left map: methamphetamine; right map: a metabolite produced by the body from cocaine). The size of each circle represents the concentration of the narcotic recovered from each municipal wastewater system, separated into four levels: . Large circles represent wastewater systems whose narcotic concentrations fall within the upper tertile (upper 33.33%) of narcotic concentrations observed out of all observed systems. . The medium circles represent wastewater systems whose narcotic concentrations fall within the middle tertile (middle 33.33%) of all observed systems. . Small circles represent wastewater systems whose narcotic concentrations fall within the lower tertile (lower 33.33%) of all observed systems. . Small black dots and x's represent wastewater systems that show traces of narcotics at such low concentrations that is impossible to quantify them. Methamphetamine Benzoylecgonine (Cocaine metabolite) O O Oo Drug Load X Not detected Drug Load Below quantification Lowest Tertile O Lowest Tertile Middle Tertile Middle Tertile Upper Tertile TO Upper Tertile RUCA Category Oo RUCA Category Urban Large Rural City/Town Large Rural City/Town 100 Miles Small Rural Town 100 Mile Small Rural Town Figure 1. Drugs detected in Oregon municipal wastewater from a single day's sample in 2008 Use this information to answer the next three questions.Question 4 1 pts Imagine the following scenario: A negative association has been identied between the amount of methamphetamine in municipal wastewater systems and the median income of the populations served by those wastewater systems. However, wealthier individuals are more likely to use septic systems at their homes, which do not contribute to municipal wastewater systems. (A septic system is an underground container that stores and treats domestic wastewater, usually serving a single domestic unit or structure such as a house.) Given this scenario, can we infer that the negative association observed between wealth and methamphetamine concentration applies to individuals? 0N0 0 Yes

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