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Just because there are high levels of lead in the water does not mean that it is necessarily having a negative effect on people. While the Flint Water Study was conducting their water testing, local pediatrician Dr. Mona Hanna-Attisha investigated blood lead levels in children. Hanna-Attisha predicted that if lead levels in water had increased, she would see higher lead levels in children. She was able to gain access to city medical records from the past several years. With these data, she could investigate if lead levels had increased after the water source switch. Furthermore, she could investigate if wards with the highest amounts of lead in their water also had children with the highest amounts of lead in their blood. Which 3 of the following 6 graphs would best support the hypothesis that lead in the water was causing elevated lead levels in children? Drag a check mark to the three graphs that best support the hypothesis. Drag an X to the three that do not support the hypothesis. (WLL stands for water lead level, and BLL stands for blood lead level.)
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