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2009 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 357,538,181 0.9765 366,142,530 28 4,402 .014913168
A 366,930,220 0.9596 382,378,303 23 2,540 .007982276
A 379,980,365 0.9924 382,890,332 22 1,673 .005173436
A 435,821,154 0.9445 461,430,549 18 884 .006392897
C 28,579,140 1.1194 25,530,766 7 2,920 .214006214
C 33,764,510 0.9648 34,996,383 8 824 .016092744
C 35,414,630 0.9107 38,887,263 7 334 .003868257
C 38,150,850 0.9868 38,661,178 6 97 .001854852
D3 78,021,720 0.9833 79,346,812 10 1,601 .171606174
F1 34,746,777 0.9984 34,802,461 8 220 .004326297
F1 41,634,649 0.9121 45,647,022 7 88 .018805946
F1 44,141,719 1.0030 44,009,690 6 35 .004282987
F1 45,337,472 0.9806 46,234,420 4 11 .000595431
Random Totals: 1,920,061,387   1,980,957,709 154 15,629  
Catg D1 Exception Values: 28,625,043   27,698,883      
Total Test Values (4): 1,948,686,430   2,008,656,592      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 100,432,830

Confidence Interval Values (5)

State Lower Limit: 1,908,223,762 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,948,686,430 (Within Confidence Interval)
State Upper Limit: 2,109,089,422 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,974,257,936 (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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