2007 Confidence Interval Detail
057/Dallas
057-912/Irving ISD
Category Summary
| (1) Category |
(1) Local Value |
(1) Stratum Ratio |
(1) State Value |
(2) Sample Size |
(3) Total Parcels |
Stratum Variance |
|---|---|---|---|---|---|---|
| A | 977,087,716 | 0.9958 | 981,208,793 | 49 | 10,042 | .001521902 |
| A | 976,752,291 | 0.9984 | 978,317,599 | 49 | 8,056 | .001136475 |
| A | 976,897,477 | 0.9660 | 1,011,281,032 | 47 | 6,176 | .030994368 |
| A | 976,818,049 | 0.9844 | 992,297,896 | 47 | 2,686 | .007569978 |
| B | 280,366,938 | 0.8198 | 341,994,313 | 11 | 526 | .066801166 |
| B | 279,897,202 | 0.9558 | 292,840,764 | 6 | 49 | .023748739 |
| B | 551,021,465 | 1.0010 | 550,470,994 | 8 | 34 | .011086284 |
| F1 | 694,951,139 | 0.8574 | 810,533,169 | 12 | 848 | .063015736 |
| F1 | 693,291,864 | 0.9301 | 745,394,973 | 7 | 176 | .009177565 |
| F1 | 718,106,966 | 0.8312 | 863,940,046 | 6 | 54 | .051434312 |
| F1 | 668,709,614 | 0.9737 | 686,771,710 | 5 | 13 | .003827189 |
| L1 | 261,178,352 | 1.1720 | 222,848,423 | 7 | 1,159 | .047453303 |
| L1 | 263,524,158 | 1.0955 | 240,551,491 | 7 | 201 | .005494144 |
| L1 | 266,693,503 | 1.1257 | 236,913,479 | 7 | 68 | .003745140 |
| L1 | 253,206,502 | 1.0763 | 235,256,436 | 6 | 15 | .009253122 |
| Random Totals: | 8,838,503,236 | 9,190,621,118 | 274 | 30,103 | ||
| Catg D1 Exception Values: | 88,433 | 67,685 | ||||
| Total Test Values (4): | 8,838,591,669 | 9,190,688,803 |
Margin of Error
| Margin of Error Percent: | 5.0000000 |
|---|---|
| Margin of Error Value: | 459,534,440 |
Confidence Interval Values (5)
| State Lower Limit: | 8,731,154,363 | (State Test Value minus Margin of Error Percent) |
|---|---|---|
| Local Test Value: | 8,838,591,669 | (Within Confidence Interval) |
| State Upper Limit: | 9,650,223,243 | (State Test Value plus Margin of Error Percent) |
| Value Assigned (6): | 9,315,564,755 | (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