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2006 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 679,578,249 1.0148 669,667,175 48 8,159 .004599016
A 679,364,837 0.9892 686,782,084 48 6,206 .009590359
A 679,213,598 0.9892 686,629,193 47 4,870 .002254702
A 679,377,991 1.0103 672,451,738 47 3,393 .002057935
B 64,488,529 1.0005 64,456,301 19 922 .006071148
B 65,242,210 0.9867 66,121,628 13 144 .001333183
B 64,811,566 0.9571 67,716,609 7 10 .006895390
B 62,949,774 1.0234 61,510,430 4 5 .000218649
F1 155,251,883 1.0451 148,552,180 9 490 .006477218
F1 155,804,203 0.9947 156,634,365 7 121 .005079812
F1 157,588,692 0.9056 174,015,782 6 37 .024375749
F1 150,211,897 0.9646 155,724,546 5 14 .011729458
L1 102,815,824 1.3496 76,182,442 7 493 .039853165
L1 103,040,339 1.0365 99,411,808 7 65 .004889361
L1 108,957,967 0.9949 109,516,501 7 21 .068824204
Random Totals: 3,908,697,559   3,895,372,782 281 24,950  
Catg D1 Exception Values: 171,990   169,974      
Catg L1 Exception Values: 80,539,360   79,620,608      
Total Test Values (4): 3,989,408,909   3,975,163,364      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 198,758,168

Confidence Interval Values (5)

State Lower Limit: 3,776,405,196 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,989,408,909 (Within Confidence Interval)
State Upper Limit: 4,173,921,532 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,306,059,565 (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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