2007 Confidence Interval Detail
057/Dallas
057-907/Duncanville ISD
Category Summary
| (1) Category |
(1) Local Value |
(1) Stratum Ratio |
(1) State Value |
(2) Sample Size |
(3) Total Parcels |
Stratum Variance |
|---|---|---|---|---|---|---|
| A | 537,106,217 | 0.9998 | 537,213,660 | 22 | 5,681 | .002181002 |
| A | 536,811,532 | 0.9783 | 548,718,728 | 24 | 4,369 | .001327388 |
| A | 536,721,921 | 0.9723 | 552,012,672 | 23 | 3,368 | .002682461 |
| A | 536,816,298 | 0.9796 | 547,995,404 | 24 | 2,075 | .005622170 |
| B | 46,266,882 | 1.2637 | 36,612,235 | 7 | 258 | .035571071 |
| B | 46,417,215 | 0.8023 | 57,855,185 | 5 | 9 | .007175199 |
| B | 44,255,280 | 0.8121 | 54,494,865 | 5 | 6 | .054725643 |
| B | 43,099,184 | 0.9101 | 47,356,537 | 4 | 5 | .019559059 |
| F1 | 137,814,407 | 0.8126 | 169,596,858 | 7 | 390 | .097709167 |
| F1 | 137,243,465 | 0.9438 | 145,415,835 | 7 | 126 | .013302666 |
| F1 | 138,674,439 | 0.9174 | 151,160,278 | 6 | 50 | .056327271 |
| F1 | 135,010,377 | 0.9583 | 140,885,294 | 6 | 19 | .022115829 |
| L1 | 65,774,803 | 1.0856 | 60,588,433 | 7 | 425 | .008398868 |
| L1 | 65,314,206 | 1.1313 | 57,733,763 | 7 | 61 | .029729462 |
| L1 | 71,813,642 | 1.0103 | 71,081,503 | 7 | 18 | .017256101 |
| L1 | 59,139,306 | 1.0285 | 57,500,541 | 5 | 6 | .003897060 |
| Random Totals: | 3,138,279,174 | 3,236,221,791 | 166 | 16,866 | ||
| Catg D1 Exception Values: | 122,105 | 134,285 | ||||
| Total Test Values (4): | 3,138,401,279 | 3,236,356,076 |
Margin of Error
| Margin of Error Percent: | 5.0000000 |
|---|---|
| Margin of Error Value: | 161,817,804 |
Confidence Interval Values (5)
| State Lower Limit: | 3,074,538,272 | (State Test Value minus Margin of Error Percent) |
|---|---|---|
| Local Test Value: | 3,138,401,279 | (Within Confidence Interval) |
| State Upper Limit: | 3,398,173,880 | (State Test Value plus Margin of Error Percent) |
| Value Assigned (6): | 3,523,067,472 | (See ISD Summary Worksheet) |
Sources:
(1) See Stratified Category Worksheet Reports PTS236, PTS430
(2) Number of parcels sampled by staff
(3) Total Category Parcels from Stratification Report, Appraisal Roll, or Self-report
(4) Includes any parcels in A, B, C, D3, F1, G1, G2, or L1 marked as exception properties
(5) Unstudied categories and sub-categories were not included in the Confidence Interval Values
(6) Includes local value of unstudied property categories and sub-categories