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2009 Confidence Interval Detail
246/Williamson
246-909/Round Rock ISD

Category Summary

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

Stratum
Variance
A 2,255,472,634 0.9789 2,304,088,910 59 15,634 .004738544
A 2,161,647,382 0.9857 2,193,007,388 55 11,461 .006389647
A 2,131,322,713 0.9874 2,158,520,066 57 8,804 .004303328
A 1,897,076,705 0.9782 1,939,354,636 57 5,456 .006901697
B 375,818,263 0.9804 383,331,562 25 2,034 .004475809
B 359,644,874 0.9412 382,113,126 6 46 .008366044
B 661,146,968 0.9328 708,776,767 5 29 .026923807
B 247,154,719 1.0059 245,705,059 5 7 .001957223
C 76,948,374 0.7992 96,281,749 7 394 .048668632
C 128,086,120 0.9411 136,102,561 9 147 .011720336
C 108,915,424 0.9878 110,260,603 8 51 .000829195
C 99,755,349 0.9584 104,085,297 7 15 .003140305
F1 782,133,432 0.9391 832,854,256 9 707 .036674597
F1 751,592,181 0.8366 898,388,933 7 174 .090888101
F1 870,829,542 0.9834 885,529,329 6 67 .011679158
F1 738,137,294 0.9697 761,201,706 5 16 .017769586
L1 185,404,879 1.0274 180,460,268 7 1,200 .013964180
L1 205,136,606 0.9698 211,524,650 8 258 .007425046
L1 166,940,703 1.0153 164,425,000 7 53 .003984215
L1 152,754,430 0.9055 168,696,223 5 14 .033811382
Random Totals: 14,355,918,592   14,864,708,089 354 46,567  
Catg D1 Exception Values: 1,810,325   1,405,401      
Total Test Values (4): 14,357,728,917   14,866,113,490      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 743,305,675

Confidence Interval Values (5)

State Lower Limit: 14,122,807,815 (State Test Value minus Margin of Error Percent)
Local Test Value: 14,357,728,917 (Within Confidence Interval)
State Upper Limit: 15,609,419,165 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 15,107,276,934 (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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