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2010 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 1,031,190,844 0.9823 1,049,771,805 64 7,021 .008994890
A 997,780,988 0.9902 1,007,656,017 59 4,929 .007456016
A 1,024,673,900 0.9915 1,033,458,296 68 3,565 .006398861
A 984,720,314 0.9940 990,664,300 65 1,817 .004682477
D3 261,518,187 1.0251 255,114,805 15 2,093 .022275442
F1 209,667,386 0.8836 237,287,671 11 322 .030401292
F1 200,507,318 0.9531 210,373,852 9 96 .039413691
F1 243,068,755 0.9164 265,243,076 8 33 .017897396
F1 150,918,380 0.9336 161,652,078 4 5 .010925517
L1 61,064,662 1.2061 50,629,850 10 565 .039332494
L1 57,459,270 1.1171 51,436,102 9 107 .018640194
L1 57,006,611 1.0207 55,850,506 7 22 .004537396
L1 63,521,630 0.9917 64,053,272 3 5 .022782659
Random Totals: 5,343,098,245   5,433,191,630 332 20,580  
Catg J Exception Values: 66,103,894   63,164,669      
Catg D1 Exception Values: 2,720,640   2,228,086      
Total Test Values (4): 5,411,922,779   5,498,584,385      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 274,929,219

Confidence Interval Values (5)

State Lower Limit: 5,223,655,166 (State Test Value minus Margin of Error Percent)
Local Test Value: 5,411,922,779 (Within Confidence Interval)
State Upper Limit: 5,773,513,604 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,700,635,699 (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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