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2007 Confidence Interval Detail
084/Galveston
084-906/Texas City ISD

Category Summary

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

Stratum
Variance
A 162,652,118 0.9876 164,694,328 27 2,947 .042692131
A 162,580,910 1.0361 156,916,234 16 1,981 .008391515
A 162,638,064 1.0259 158,532,083 18 1,449 .004202503
A 162,470,842 1.0090 161,021,647 16 920 .001777924
F1 18,366,460 0.9523 19,286,422 8 255 .006824119
F1 18,263,736 1.0222 17,867,087 7 93 .019259110
F1 18,862,646 0.9887 19,078,230 6 41 .002593776
F1 17,580,874 0.8872 19,816,134 5 12 .007797078
L1 15,407,506 1.0276 14,993,680 7 249 .022110399
L1 15,299,904 0.9959 15,362,892 6 41 .009959855
L1 17,458,157 0.9185 19,007,248 4 11 .037139077
L1 12,844,373 1.0000 12,844,373 2 3
Random Totals: 784,425,590   779,420,358 122 8,002  
Catg J Exception Values: 20,859,407   21,525,010      
Catg D1 Exception Values: 14,809   10,148      
Total Test Values (4): 805,299,806   800,955,516      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 40,047,776

Confidence Interval Values (5)

State Lower Limit: 760,907,740 (State Test Value minus Margin of Error Percent)
Local Test Value: 805,299,806 (Within Confidence Interval)
State Upper Limit: 841,003,292 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,184,197,438 (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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