A health advocacy organization is trying to isolate the sources of health problems in the city. Some debate centers on whether health problems are related to family income or to frequency of city garbage collection. The accompanying tables display data for all neighborhoods in the city regarding average income of residents (low or high), frequency of city garbage collection (once per week or twice per week), and frequency of health problems reported in the neighborhood (low or high). Analyze these data and discuss the sources of health problems in the city.
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