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2006 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 273,081,413 0.9327 292,785,904 31 3,918 .030954646
A 272,912,635 0.9559 285,503,332 38 2,012 .012179114
A 273,176,467 0.9389 290,953,741 31 1,273 .009553894
A 272,786,250 0.9210 296,184,853 23 645 .013705508
C 25,261,227 0.9517 26,543,267 8 4,164 .004918438
C 25,280,980 1.0485 24,111,569 10 1,209 .024565147
C 25,278,785 0.9974 25,344,681 9 446 .032573769
C 25,179,739 0.9815 25,654,344 12 169 .001876985
D3 54,489,875 0.9613 56,683,528 10 1,965 .021328240
F1 26,991,155 0.9485 28,456,674 7 212 .004444391
F1 26,880,892 0.9678 27,775,255 6 64 .007151182
F1 26,807,393 0.9394 28,536,718 6 27 .017848895
F1 26,679,186 0.9617 27,741,693 5 7 .012502476
L1 20,162,173 0.9392 21,467,390 7 281 .008760997
L1 20,126,199 0.9581 21,006,366 7 63 .220937638
L1 20,369,882 0.9969 20,433,225 6 13 .004573001
Random Totals: 1,415,464,251   1,499,182,540 216 16,468  
Catg D1 Exception Values: 33,135,840   32,608,329      
Catg L1 Exception Values: 18,127,837   19,442,774      
Total Test Values (4): 1,466,727,928   1,551,233,643      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 77,561,682

Confidence Interval Values (5)

Local Test Value: 1,466,727,928 (Outside Confidence Interval)
State Lower Limit: 1,473,671,961 (State Test Value minus Margin of Error Percent)
State Upper Limit: 1,628,795,325 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,511,125,194 (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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