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2008 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 2,172,214,631 1.0097 2,151,346,569 25 15,414 .003907370
A 2,647,387,235 0.9755 2,713,877,227 25 13,858 .009583261
A 2,223,942,307 1.0277 2,163,999,520 25 8,629 .002464594
A 1,624,868,218 0.9848 1,649,947,419 25 4,358 .005515160
B 355,232,810 1.0093 351,959,586 26 1,822 .007499630
B 391,661,850 0.9744 401,951,817 7 49 .002820448
B 286,835,585 1.0262 279,512,361 5 14 .003443629
B 445,450,000 0.9505 468,648,080 5 13 .002409638
C 113,487,505 1.0574 107,326,939 14 1,793 .234611812
C 110,779,902 1.0216 108,437,649 9 164 .008562041
C 108,727,628 0.9733 111,710,293 7 64 .001973223
C 159,344,292 1.0011 159,169,206 6 28 .000603834
F1 804,278,298 1.0079 797,974,301 12 668 .022656532
F1 765,804,105 0.8528 897,987,928 7 157 .031606044
F1 670,798,591 1.0043 667,926,507 6 50 .001125050
F1 734,613,990 0.9844 746,255,577 5 13 .002052243
L1 209,337,524 1.0854 192,866,707 7 1,218 .051693149
L1 200,524,999 1.0051 199,507,511 7 218 .004569759
L1 156,025,884 1.0348 150,778,782 6 45 .027199218
L1 204,047,339 1.0071 202,608,816 6 16 .009757863
Random Totals: 14,385,362,693   14,523,792,795 235 48,591  
Catg D1 Exception Values: 1,713,878   1,367,697      
Total Test Values (4): 14,387,076,571   14,525,160,492      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 726,258,025

Confidence Interval Values (5)

State Lower Limit: 13,798,902,467 (State Test Value minus Margin of Error Percent)
Local Test Value: 14,387,076,571 (Within Confidence Interval)
State Upper Limit: 15,251,418,517 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 14,972,590,137 (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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