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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 722,928,208 0.9808 737,080,147 21 8,493 .006971835
A 722,463,709 0.9713 743,811,087 25 6,469 .003152956
A 722,675,333 0.9672 747,182,933 23 5,141 .002435900
A 722,564,059 0.9834 734,761,093 24 3,598 .006559201
B 66,722,702 0.9214 72,414,480 7 941 .026516451
B 70,990,727 0.7668 92,580,499 7 136 .247657912
B 66,790,975 0.7953 83,982,114 6 10 .074743454
F1 178,328,527 0.9023 197,637,734 7 492 .028027981
F1 178,599,390 0.8962 199,285,193 7 120 .021492775
F1 179,195,953 0.8701 205,948,688 7 37 .037044622
F1 174,048,840 0.8224 211,635,263 5 14 .007666436
L1 121,113,421 1.1725 103,295,029 7 487 .026993902
L1 123,983,083 1.0158 122,054,620 7 59 .022636674
L1 127,120,535 1.0365 122,644,028 6 16 .011900190
Random Totals: 4,177,525,462   4,374,312,908 159 26,013  
Catg D1 Exception Values: 153,248   150,995      
Catg B Exception Values: 64,226,550   68,356,000      
Catg L1 Exception Values: 118,611,450   116,477,774      
Total Test Values (4): 4,360,516,710   4,559,297,677      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 227,964,884

Confidence Interval Values (5)

State Lower Limit: 4,331,332,793 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,360,516,710 (Within Confidence Interval)
State Upper Limit: 4,787,262,561 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,531,963,502 (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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