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2007 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 723,022,370 0.9808 737,176,152 21 8,493 .006971835
A 722,557,811 0.9713 743,907,970 25 6,469 .003152956
A 722,769,463 0.9672 747,280,255 23 5,141 .002435900
A 722,658,174 0.9834 734,856,797 24 3,598 .006559201
B 67,946,432 0.9214 73,742,600 7 941 .026516451
B 72,292,735 0.7668 94,278,475 7 136 .247657912
B 68,015,957 0.7953 85,522,390 6 10 .074743454
F1 180,939,410 0.9023 200,531,320 7 492 .028027981
F1 181,214,239 0.8962 202,202,900 7 120 .021492775
F1 181,819,536 0.8701 208,963,954 7 37 .037044622
F1 176,597,064 0.8224 214,733,784 5 14 .007666436
L1 120,810,031 1.1725 103,036,274 7 487 .026993902
L1 123,672,505 1.0158 121,748,873 7 59 .022636674
L1 126,802,097 1.0365 122,336,804 6 16 .011900190
Random Totals: 4,191,117,824   4,390,318,548 159 26,013  
Catg D1 Exception Values: 153,248   151,260      
Catg B Exception Values: 64,226,550   68,356,000      
Catg L1 Exception Values: 118,611,450   116,477,774      
Total Test Values (4): 4,374,109,072   4,575,303,582      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 228,765,179

Confidence Interval Values (5)

State Lower Limit: 4,346,538,403 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,374,109,072 (Within Confidence Interval)
State Upper Limit: 4,804,068,761 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,719,831,619 (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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