Statistics | 2010 | 2005 | 2015 | |||||||
Census Data | Violations | TTHM | Violations | TTHM | ||||||
Population | Income | Systems | Total | TTHM | [ppb] | Total | TTHM | [ppb] | % Change | |
Mean (M) | 7,663,038 | $43,244 | 1567.4 | 2292.1 | 193.2 | 36.1 | 2080.6 | 89.6 | 67.7 | +101.3% |
Standard Error | 1.8E+6 | 1588.0 | 472.3 | 713.9 | 74.6 | 2.6 | 715.4 | 32.1 | 2.9 | 19.0 |
Variance | 4.4E+13 | 4.0E+7 | 3.1E+6 | 7.1E+6 | 7.8E+4 | 91.5 | 7.2E+6 | 1.4E+4 | 119.6 | 5029.4 |
Standard Deviation (SD) | 6.6E+6 | 5,942.4 | 1767.3 | 2671.4 | 279.3 | 9.6 | 2676.8 | 120.3 | 10.9 | 70.9 |