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2007 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 3,177,740,854 0.9874 3,218,291,325 72 18,863 .004080268
A 3,174,430,421 0.9903 3,205,524,004 67 8,105 .005161207
A 3,177,095,651 0.9557 3,324,365,021 74 4,080 .005805571
A 3,173,773,623 0.9765 3,250,152,200 79 1,880 .005935837
B 157,725,810 1.0994 143,465,354 6 89 .053393585
B 156,655,418 0.9082 172,490,000 6 33 .006612626
B 151,443,276 0.8505 178,063,817 6 18 .079524234
B 152,407,741 0.9969 152,881,674 3 8 .000404726
C 68,906,505 0.7284 94,599,815 11 442 .088319342
C 69,616,475 0.8344 83,432,976 8 93 .027526398
C 135,583,909 0.8771 154,582,042 8 53 .020233001
F1 839,389,103 0.9026 929,967,985 15 865 .055321112
F1 839,168,160 0.8122 1,033,203,841 8 209 .098846501
F1 856,808,835 0.9261 925,179,608 7 74 .006866113
F1 810,981,589 0.9746 832,117,370 5 21 .009488186
L1 273,337,714 0.9991 273,583,940 8 2,563 .000929292
L1 274,540,364 0.9477 289,691,215 10 380 .011677564
L1 278,565,354 0.9847 282,893,626 8 116 .000391833
L1 269,292,848 1.0700 251,675,559 8 35 .055750212
Random Totals: 18,037,463,650   18,796,161,372 409 37,927  
Catg D1 Exception Values: 18,340   17,438      
Total Test Values (4): 18,037,481,990   18,796,178,810      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 939,808,941

Confidence Interval Values (5)

State Lower Limit: 17,856,369,869 (State Test Value minus Margin of Error Percent)
Local Test Value: 18,037,481,990 (Within Confidence Interval)
State Upper Limit: 19,735,987,751 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 16,894,509,877 (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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