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2008 Confidence Interval Detail
057/Dallas
057-910/Grand Prairie ISD

Category Summary

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

Stratum
Variance
A 715,831,130 1.0216 700,696,094 35 8,754 .031003559
A 737,640,140 1.0318 714,906,125 35 6,784 .007307352
A 773,155,790 1.0163 760,755,476 35 5,614 .002200503
A 779,364,720 1.0076 773,486,225 35 3,991 .003828199
B 66,489,220 1.0467 63,522,709 8 952 .011584196
B 61,355,560 1.1385 53,891,577 11 116 .006067837
B 79,358,490 0.9989 79,445,880 4 13 .001869961
B 73,700,930 0.8723 84,490,347 3 5 .009611320
F1 189,824,840 0.6937 273,641,113 7 516 .071405683
F1 205,017,240 0.9888 207,339,442 7 133 .037657158
F1 178,999,240 0.9348 191,483,997 6 37 .013069394
F1 235,777,740 0.9884 238,544,860 5 18 .002274964
L1 125,397,670 1.2718 98,598,577 7 498 .012532451
L1 141,658,620 1.1089 127,746,974 6 62 .012634209
L1 137,433,270 1.0105 136,005,215 5 15 .000175046
Random Totals: 4,501,004,600   4,504,554,611 209 27,508  
Catg D1 Exception Values: 138,303   142,080      
Catg L1 Exception Values: 90,168,910   90,670,310      
Total Test Values (4): 4,591,311,813   4,595,367,001      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 229,768,350

Confidence Interval Values (5)

State Lower Limit: 4,365,598,651 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,591,311,813 (Within Confidence Interval)
State Upper Limit: 4,825,135,351 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,910,211,640 (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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