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2011 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 157,982,829 1.0706 147,564,757 19 3,070 .140584665
A 156,398,005 1.0559 148,118,198 13 1,901 .054642532
A 159,937,245 1.0155 157,496,056 11 1,391 .005944076
A 158,851,680 1.0061 157,888,560 10 847 .004774698
F1 17,292,018 1.0363 16,686,305 10 244 .005433011
F1 18,489,800 0.9104 20,309,534 9 96 .095955410
F1 16,485,890 1.0515 15,678,450 8 38 .006813612
F1 17,149,860 0.9861 17,391,603 6 14 .013062572
L1 16,813,910 1.0129 16,599,773 10 254 .005961428
L1 15,648,515 1.0722 14,594,772 8 38 .017354320
L1 34,644,359 1.0342 33,498,703 8 15 .038278655
Random Totals: 769,694,111   745,826,711 112 7,908  
Catg J Exception Values: 7,014,914   7,088,298      
Catg D1 Exception Values: 14,689   19,456      
Total Test Values (4): 776,723,714   752,934,465      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 37,646,723

Confidence Interval Values (5)

State Lower Limit: 715,287,742 (State Test Value minus Margin of Error Percent)
Local Test Value: 776,723,714 (Within Confidence Interval)
State Upper Limit: 790,581,188 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,870,200,866 (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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