| Mean | Standard deviation | Standard error | 95-percent confidence interval for mean | Minimum | Maximum | ||
|---|---|---|---|---|---|---|---|
| Lower bound | Upper bound | ||||||
Northeast |
0.03255 | 0.014360 | 0.002073 | 0.02838 | 0.03672 | 0.004 | 0.076 |
Midwest |
0.03157 | 0.010840 | 0.001565 | 0.02843 | 0.03472 | 0.015 | 0.056 |
South |
0.05891 | 0.015556 | 0.002245 | 0.05440 | 0.06343 | 0.025 | 0.090 |
West |
0.04205 | 0.015447 | 0.002230 | 0.03757 | 0.04654 | 0.019 | 0.089 |
Total |
0.04127 | 0.017861 | 0.001289 | 0.03873 | 0.04382 | 0.004 | 0.090 |