2011 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 | 416,781,221 | 1.0152 | 410,540,998 | 36 | 4,880 | .017111019 |
| A | 375,555,690 | 0.9868 | 380,579,337 | 48 | 2,460 | .005956646 |
| A | 405,749,520 | 0.9653 | 420,335,150 | 30 | 1,580 | .007484245 |
| A | 420,958,080 | 0.9840 | 427,802,927 | 25 | 804 | .003397589 |
| C | 28,221,260 | 1.0775 | 26,191,425 | 18 | 2,951 | .049582264 |
| C | 27,896,220 | 1.0079 | 27,677,567 | 16 | 644 | .023634352 |
| C | 27,700,380 | 1.0239 | 27,053,794 | 14 | 269 | .009912850 |
| C | 29,926,290 | 1.0216 | 29,293,549 | 14 | 109 | .018353478 |
| F1 | 43,179,992 | 1.0802 | 39,974,071 | 10 | 223 | .004319762 |
| F1 | 41,307,885 | 1.0237 | 40,351,553 | 9 | 76 | .005337169 |
| F1 | 46,499,205 | 1.0323 | 45,044,275 | 8 | 35 | .012403849 |
| F1 | 54,405,261 | 0.9068 | 59,996,979 | 6 | 12 | .093818410 |
| Random Totals: | 1,918,181,004 | 1,934,841,625 | 234 | 14,043 | ||
| Catg D1 Exception Values: | 28,385,578 | 27,780,125 | ||||
| Total Test Values (4): | 1,946,566,582 | 1,962,621,750 |
Margin of Error
| Margin of Error Percent: | 5.0000000 |
|---|---|
| Margin of Error Value: | 98,131,088 |
Confidence Interval Values (5)
| State Lower Limit: | 1,864,490,662 | (State Test Value minus Margin of Error Percent) |
|---|---|---|
| Local Test Value: | 1,946,566,582 | (Within Confidence Interval) |
| State Upper Limit: | 2,060,752,838 | (State Test Value plus Margin of Error Percent) |
| Value Assigned (6): | 2,067,130,819 | (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