2007 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 | 319,827,244 | 0.9958 | 321,176,184 | 55 | 4,110 | .015146182 |
| A | 319,848,952 | 0.9643 | 331,690,296 | 58 | 2,151 | .006395297 |
| A | 319,797,296 | 0.9839 | 325,030,284 | 29 | 1,379 | .007523214 |
| A | 319,798,345 | 0.9397 | 340,319,618 | 24 | 702 | .028443676 |
| C | 25,891,683 | 0.9688 | 26,725,519 | 15 | 3,754 | .021318224 |
| C | 25,891,021 | 1.0115 | 25,596,659 | 14 | 890 | .011245911 |
| C | 25,967,595 | 1.0195 | 25,470,912 | 7 | 312 | .023190197 |
| C | 25,765,657 | 0.9692 | 26,584,458 | 8 | 100 | .005641495 |
| D3 | 81,926,051 | 0.9323 | 87,875,202 | 10 | 1,909 | .030285173 |
| F1 | 31,794,046 | 0.9716 | 32,723,390 | 7 | 220 | .006865883 |
| F1 | 31,583,140 | 0.9130 | 34,592,705 | 6 | 69 | .005409122 |
| F1 | 32,432,540 | 0.9589 | 33,822,651 | 7 | 28 | .023603763 |
| F1 | 30,674,313 | 0.9670 | 31,721,110 | 4 | 6 | .009365550 |
| L1 | 19,305,843 | 0.9631 | 20,045,523 | 8 | 271 | .020462727 |
| L1 | 19,241,519 | 0.9926 | 19,384,968 | 7 | 51 | .001841012 |
| L1 | 21,031,614 | 0.9580 | 21,953,668 | 5 | 12 | .006719375 |
| Random Totals: | 1,650,776,859 | 1,704,713,147 | 264 | 15,964 | ||
| Catg D1 Exception Values: | 35,156,584 | 34,394,945 | ||||
| Catg L1 Exception Values: | 22,577,632 | 22,480,972 | ||||
| Total Test Values (4): | 1,708,511,075 | 1,761,589,064 |
Margin of Error
| Margin of Error Percent: | 5.0000000 |
|---|---|
| Margin of Error Value: | 88,079,453 |
Confidence Interval Values (5)
| State Lower Limit: | 1,673,509,611 | (State Test Value minus Margin of Error Percent) |
|---|---|---|
| Local Test Value: | 1,708,511,075 | (Within Confidence Interval) |
| State Upper Limit: | 1,849,668,517 | (State Test Value plus Margin of Error Percent) |
| Value Assigned (6): | 1,680,060,319 | (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