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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

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