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2006 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 2,320,494,976 0.9641 2,406,902,786 57 16,985 .005510424
A 2,320,559,920 0.9647 2,405,473,121 57 12,885 .007116605
A 2,320,603,784 0.9807 2,366,272,850 57 9,574 .005851397
A 2,320,218,144 0.9662 2,401,384,955 57 6,368 .004485923
B 405,904,071 0.9568 424,230,843 57 1,998 .007235171
B 401,822,412 0.9052 443,904,565 7 47 .023317247
B 404,123,468 0.9827 411,237,883 5 20 .007027455
B 392,379,668 1.0159 386,238,476 6 12 .003957638
C 109,197,125 0.9795 111,482,517 17 2,172 .020037961
C 109,850,809 0.9945 110,458,330 8 226 .008463552
C 109,380,531 1.0118 108,104,893 8 79 .007826920
C 108,312,390 1.0035 107,934,619 7 20 .000438006
F1 738,420,959 0.9729 758,989,577 10 682 .007962730
F1 742,256,307 0.9036 821,443,456 10 178 .029967654
F1 734,180,707 0.9898 741,746,522 9 62 .002808650
F1 733,379,658 0.9305 788,156,537 8 15 .005637201
L1 245,316,438 1.0174 241,120,934 7 1,298 .009066650
L1 245,450,181 0.9740 252,002,239 7 211 .002387441
L1 249,806,354 0.9881 252,814,851 7 55 .015764087
L1 239,083,826 0.9672 247,191,714 5 13 .000173967
Random Totals: 15,250,741,728   15,787,091,668 406 52,900  
Catg D1 Exception Values: 2,012,192   1,932,306      
Total Test Values (4): 15,252,753,920   15,789,023,974      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 789,451,199

Confidence Interval Values (5)

State Lower Limit: 14,999,572,775 (State Test Value minus Margin of Error Percent)
Local Test Value: 15,252,753,920 (Within Confidence Interval)
State Upper Limit: 16,578,475,173 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 16,298,141,871 (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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