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2008 Confidence Interval Detail
101/Harris
101-920/Spring Branch ISD

Category Summary

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

Stratum
Variance
A 3,083,065,578 0.9706 3,176,453,305 28 18,644 .009253505
A 3,427,354,647 0.9644 3,553,872,508 29 8,477 .007812480
A 3,374,949,493 0.9501 3,552,204,497 26 4,178 .005641959
A 4,238,771,865 0.9508 4,458,110,922 31 2,322 .004550909
B 142,851,402 0.8235 173,468,612 5 82 .057502307
B 125,756,480 0.8725 144,133,501 6 28 .007871437
B 209,862,285 1.0255 204,643,866 5 27 .000514878
B 227,660,884 0.9608 236,949,296 4 10 .028344880
C 74,633,857 0.8616 86,622,397 9 368 .023607194
C 67,109,669 0.8861 75,735,999 8 93 .019972848
C 88,469,133 0.9466 93,459,891 6 62 .005018043
C 60,194,948 0.9059 66,447,674 4 12 .010244158
F1 838,441,408 0.8724 961,074,516 18 869 .022191427
F1 911,190,891 0.9435 965,756,111 12 230 .029967129
F1 1,024,248,862 0.9799 1,045,258,559 8 95 .005132763
F1 1,037,122,806 0.9365 1,107,445,602 5 26 .005843725
L1 275,510,830 1.0177 270,719,102 7 2,306 .013654481
L1 259,186,723 1.0675 242,797,867 8 320 .010238723
L1 253,227,942 1.0059 251,742,660 9 96 .001114441
L1 276,176,249 0.9927 278,207,161 6 35 .000102565
Random Totals: 19,995,785,952   20,945,104,046 234 38,280  
Catg D1 Exception Values: 368,425   369,317      
Total Test Values (4): 19,996,154,377   20,945,473,363      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,047,273,668

Confidence Interval Values (5)

State Lower Limit: 19,898,199,695 (State Test Value minus Margin of Error Percent)
Local Test Value: 19,996,154,377 (Within Confidence Interval)
State Upper Limit: 21,992,747,031 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 18,345,691,727 (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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