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2007 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 2,625,158,900 0.9743 2,694,405,111 26 17,852 .006057478
A 2,625,116,334 1.0051 2,611,796,174 23 13,465 .004777174
A 2,624,987,724 1.0118 2,594,374,110 26 9,813 .003642298
A 2,624,973,877 0.9842 2,667,114,283 24 6,423 .005144877
B 465,581,337 0.9859 472,239,920 25 2,185 .004568599
B 466,791,212 1.0085 462,856,928 6 49 .002595935
B 473,312,698 0.9393 503,899,391 5 20 .003154450
B 455,739,699 0.9928 459,044,822 4 12 .007390966
C 107,982,799 0.9655 111,841,325 8 1,549 .005029838
C 108,049,187 0.9143 118,176,952 10 182 .013161252
C 108,198,274 0.9079 119,174,220 9 70 .043844183
C 106,429,364 1.0089 105,490,499 9 17 .001433114
F1 868,970,377 0.9636 901,795,742 11 710 .021749157
F1 869,890,382 0.8810 987,389,764 7 176 .051767910
F1 865,711,727 1.0403 832,175,072 6 63 .001579550
F1 860,733,242 0.9997 860,991,539 6 16 .006328368
L1 240,158,942 0.9868 243,371,445 8 1,268 .034002487
L1 240,078,044 0.9766 245,830,477 7 170 .005809518
L1 250,845,611 1.0011 250,569,984 6 41 .004865088
L1 228,215,562 0.9533 239,395,324 2 6 .000879249
Random Totals: 17,216,925,292   17,481,933,082 228 54,087  
Catg D1 Exception Values: 1,882,338   1,701,447      
Total Test Values (4): 17,218,807,630   17,483,634,529      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 874,181,726

Confidence Interval Values (5)

State Lower Limit: 16,609,452,803 (State Test Value minus Margin of Error Percent)
Local Test Value: 17,218,807,630 (Within Confidence Interval)
State Upper Limit: 18,357,816,255 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 18,729,055,347 (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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