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2009 Confidence Interval Detail
031/Cameron
031-901/Brownsville ISD

Category Summary

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

Stratum
Variance
A 792,249,617 1.0020 790,668,280 51 17,122 .023799363
A 721,917,711 1.0361 696,764,512 49 9,590 .018904692
A 728,664,335 1.0103 721,235,608 65 6,610 .020338866
A 756,498,594 1.0067 751,463,787 63 3,754 .027510170
F1 270,500,138 0.9441 286,516,405 13 1,305 .018375033
F1 276,769,595 0.9513 290,938,290 13 391 .010602771
F1 279,499,666 0.9687 288,530,676 12 134 .005283340
F1 259,231,905 0.9633 269,108,175 10 34 .005518582
L1 99,576,753 1.0508 94,762,803 7 1,255 .058876171
L1 103,945,568 1.0522 98,788,793 9 283 .009234005
L1 98,398,104 1.1089 88,734,876 7 83 .045045322
L1 99,561,543 1.0197 97,638,073 6 19 .002142182
Random Totals: 4,486,813,529   4,475,150,278 305 40,580  
Catg D1 Exception Values: 5,787,154   5,748,588      
Total Test Values (4): 4,492,600,683   4,480,898,866      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 224,044,943

Confidence Interval Values (5)

State Lower Limit: 4,256,853,923 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,492,600,683 (Within Confidence Interval)
State Upper Limit: 4,704,943,809 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,926,842,237 (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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