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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Frequency of Health Problems Low High Average Income LowHigh 180 120 103 147 Garbage Collection Once per Week Garbage Collection Twice per Week Average Income Average Income Frequency of Frequency of Health Health Low Hi High 10 12 Low Low 25 56 170 108 Low 91