2008 Confidence Interval Detail
170/Montgomery
170-904/Willis ISD
Category Summary
| (1) Category |
(1) Local Value |
(1) Stratum Ratio |
(1) State Value |
(2) Sample Size |
(3) Total Parcels |
Stratum Variance |
|---|---|---|---|---|---|---|
| A | 332,473,775 | 0.9780 | 339,952,735 | 19 | 4,353 | .015465910 |
| A | 340,710,460 | 0.9740 | 349,805,400 | 16 | 2,511 | .001788055 |
| A | 389,671,675 | 0.9492 | 410,526,417 | 17 | 1,844 | .005590683 |
| A | 404,581,221 | 1.0089 | 401,012,212 | 17 | 898 | .007198450 |
| C | 28,285,170 | 0.7328 | 38,598,758 | 10 | 3,417 | .144091091 |
| C | 26,007,246 | 0.7299 | 35,631,245 | 7 | 845 | .157356377 |
| C | 31,563,270 | 1.0014 | 31,519,143 | 7 | 384 | .017588906 |
| C | 43,360,950 | 0.8320 | 52,116,526 | 9 | 147 | .257777322 |
| D3 | 83,746,610 | 0.9844 | 85,073,761 | 10 | 1,615 | .007255339 |
| F1 | 32,670,790 | 0.9809 | 33,306,953 | 7 | 220 | .007979336 |
| F1 | 34,650,728 | 0.9372 | 36,972,608 | 6 | 79 | .003776063 |
| F1 | 33,919,897 | 0.9699 | 34,972,571 | 6 | 28 | .011226565 |
| F1 | 36,036,492 | 0.9437 | 38,186,386 | 4 | 9 | .001950738 |
| Random Totals: | 1,817,678,284 | 1,887,674,715 | 135 | 16,350 | ||
| Catg D1 Exception Values: | 28,658,731 | 27,797,101 | ||||
| Total Test Values (4): | 1,846,337,015 | 1,915,471,816 |
Margin of Error
| Margin of Error Percent: | 5.0000000 |
|---|---|
| Margin of Error Value: | 95,773,591 |
Confidence Interval Values (5)
| State Lower Limit: | 1,819,698,225 | (State Test Value minus Margin of Error Percent) |
|---|---|---|
| Local Test Value: | 1,846,337,015 | (Within Confidence Interval) |
| State Upper Limit: | 2,011,245,407 | (State Test Value plus Margin of Error Percent) |
| Value Assigned (6): | 1,853,672,020 | (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