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2010 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 2,032,647,079 0.9694 2,096,809,448 60 14,251 .003513261
A 2,220,684,684 0.9729 2,282,541,560 60 12,008 .005272245
A 2,121,710,368 0.9602 2,209,654,622 59 9,010 .004321675
A 1,978,472,598 0.9724 2,034,628,340 61 5,923 .004057030
B 424,583,604 1.0025 423,524,792 22 1,969 .008514222
B 399,900,996 0.9067 441,051,060 8 39 .021148183
B 515,642,981 0.9589 537,744,271 6 23 .003416307
B 221,957,301 0.9895 224,312,583 5 7 .003189204
C 102,441,279 0.9503 107,798,884 12 248 .008934205
C 101,376,121 0.9721 104,285,692 12 93 .006029125
C 96,617,722 0.9672 99,894,254 9 43 .008396504
C 72,629,379 0.9317 77,953,611 7 11 .016478522
F1 806,116,369 0.9687 832,163,073 12 717 .006552862
F1 766,070,523 0.9779 783,383,294 9 174 .001046065
F1 802,818,050 0.9823 817,283,976 9 61 .000103598
F1 601,317,470 0.9917 606,350,176 6 12 .000130678
L1 166,881,830 1.0352 161,207,332 10 1,190 .003593420
L1 158,394,385 0.9609 164,839,614 10 241 .032994127
L1 174,775,681 1.0049 173,923,456 10 68 .006551419
L1 120,589,929 1.0209 118,121,196 6 13 .002511715
Random Totals: 13,885,628,349   14,297,471,234 393 46,101  
Catg J Exception Values: 122,919,303   118,962,744      
Catg D1 Exception Values: 1,786,363   1,556,991      
Total Test Values (4): 14,010,334,015   14,417,990,969      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 720,899,548

Confidence Interval Values (5)

State Lower Limit: 13,697,091,421 (State Test Value minus Margin of Error Percent)
Local Test Value: 14,010,334,015 (Within Confidence Interval)
State Upper Limit: 15,138,890,517 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 14,714,928,220 (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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