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2011 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 3,411,004,217 0.9530 3,579,227,930 41 18,505 .008487248
A 3,700,999,550 0.9457 3,913,502,749 44 7,787 .008358534
A 3,642,147,837 0.9543 3,816,564,851 44 3,931 .010401985
A 3,836,975,241 0.9370 4,094,957,568 43 1,908 .013435636
B 213,614,113 0.9011 237,059,275 12 92 .018185795
B 198,021,414 0.9707 203,998,572 8 31 .002390021
B 159,356,591 0.9864 161,553,722 8 10 .010197725
C 74,199,097 0.9534 77,825,778 11 414 .003588277
C 64,049,753 1.0293 62,226,516 10 93 .007576295
C 90,007,119 0.9523 94,515,509 10 67 .039490279
C 80,778,562 1.0312 78,334,525 10 21 .015844570
F1 964,303,106 0.9049 1,065,646,045 11 927 .010615998
F1 975,874,398 0.9937 982,061,385 10 212 .020536616
F1 1,009,106,420 0.9684 1,042,034,717 10 72 .009791018
F1 1,003,134,632 0.9923 1,010,918,706 6 18 .002316787
L1 266,954,869 0.9567 279,037,179 10 2,193 .035327083
L1 271,191,007 0.9793 276,923,320 10 322 .005687833
L1 270,485,227 0.9599 281,784,797 10 98 .004022981
L1 219,576,070 0.9628 228,059,898 7 24 .004251408
Random Totals: 20,451,779,223   21,486,233,042 315 36,725  
Catg D1 Exception Values: 368,612   368,899      
Catg B Exception Values: 185,835,517   198,327,000      
Total Test Values (4): 20,637,983,352   21,684,928,941      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,084,246,447

Confidence Interval Values (5)

State Lower Limit: 20,600,682,494 (State Test Value minus Margin of Error Percent)
Local Test Value: 20,637,983,352 (Within Confidence Interval)
State Upper Limit: 22,769,175,388 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 19,577,772,892 (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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