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2009 Confidence Interval Detail
199/Rockwall
199-901/Rockwall ISD

Category Summary

(1)
Category
(1)
Local
Value
(1)
Stratum
Ratio
(1)
State
Value
(2)
Sample
Size
(3)
Total
Parcels

Stratum
Variance
A 999,820,003 0.9613 1,040,070,741 21 6,816 .022048646
A 991,764,007 1.0162 975,953,559 23 4,924 .006031410
A 1,012,140,111 0.9305 1,087,737,895 21 3,553 .075248378
A 1,022,383,054 0.9445 1,082,459,560 23 1,890 .019104724
D3 262,274,965 0.9107 287,992,714 11 2,068 .065915230
F1 197,662,698 0.9381 210,705,360 9 317 .040508012
F1 216,844,437 0.9768 221,994,714 9 104 .011265740
F1 182,488,725 0.9614 189,815,607 6 27 .000797551
F1 212,144,840 1.0610 199,948,011 5 7 .011357436
L1 59,092,320 1.0940 54,014,918 8 567 .010945592
L1 64,306,150 1.0362 62,059,593 7 127 .014252765
L1 63,724,850 0.9993 63,769,489 5 25 .003867205
L1 63,025,700 0.8203 76,832,500 3 5 .042136622
Random Totals: 5,347,671,860   5,553,354,661 151 20,430  
Catg D1 Exception Values: 2,725,560   2,396,431      
Total Test Values (4): 5,350,397,420   5,555,751,092      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 277,787,555

Confidence Interval Values (5)

State Lower Limit: 5,277,963,537 (State Test Value minus Margin of Error Percent)
Local Test Value: 5,350,397,420 (Within Confidence Interval)
State Upper Limit: 5,833,538,647 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,715,742,549 (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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