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2008 Confidence Interval Detail
020/Brazoria
020-907/Columbia-Brazoria ISD

Category Summary

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

Stratum
Variance
A 130,400,413 1.0323 126,320,268 17 2,073 .024704321
A 134,203,089 0.9807 136,844,182 20 1,333 .001044661
A 135,533,840 0.9951 136,201,226 20 939 .000956842
A 141,225,887 0.9888 142,825,533 20 599 .004932093
C 6,242,350 0.7281 8,573,479 7 1,177 .331252482
C 18,205,500 1.0636 17,116,867 15 2,044 .043037883
C 11,566,370 1.1265 10,267,528 8 731 .036623978
C 11,563,500 1.0344 11,178,944 10 323 .043362229
D3 65,770,400 0.9803 67,092,115 13 3,497 .001517731
F1 12,992,343 0.9105 14,269,460 8 180 .025648669
F1 13,346,811 0.8088 16,501,992 8 73 .031049387
F1 12,701,806 0.9158 13,869,629 6 25 .007550551
F1 15,719,990 0.8378 18,763,416 4 12 .005008552
Random Totals: 709,472,299   719,824,639 156 13,006  
Catg J Exception Values: 31,190,933   31,476,256      
Catg D1 Exception Values: 8,881,200   9,805,598      
Total Test Values (4): 749,544,432   761,106,493      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 38,055,325

Confidence Interval Values (5)

State Lower Limit: 723,051,168 (State Test Value minus Margin of Error Percent)
Local Test Value: 749,544,432 (Within Confidence Interval)
State Upper Limit: 799,161,818 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 807,464,116 (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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