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2009 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 737,764,550 1.0115 729,376,718 45 9,014 .009455804
A 632,797,440 0.9653 655,544,846 45 5,673 .009880553
A 737,273,390 1.0125 728,171,249 45 5,281 .013793037
A 687,134,230 1.0178 675,117,145 45 3,520 .010100938
B 65,425,610 1.1145 58,704,002 16 911 .105319170
B 67,794,250 0.9747 69,553,965 7 65 .010614889
B 65,219,310 0.9683 67,354,446 4 10 .029012314
B 48,866,770 1.0313 47,383,661 3 3 .000266845
F1 199,135,750 0.9687 205,570,094 8 504 .015555766
F1 220,657,730 0.9209 239,610,957 7 129 .009430541
F1 188,448,810 0.8916 211,360,262 7 35 .013208161
F1 257,510,690 0.9511 270,750,384 5 18 .004638120
L1 132,118,240 1.1094 119,089,814 7 446 .038108831
L1 131,639,700 1.0151 129,681,509 6 51 .001995154
L1 201,417,710 1.0079 199,838,982 5 19 .000154512
L1 104,215,010 1.0087 103,316,159 2 3 .000170858
Random Totals: 4,477,419,190   4,510,424,193 257 25,682  
Catg D1 Exception Values: 151,664   155,531      
Total Test Values (4): 4,477,570,854   4,510,579,724      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 225,528,986

Confidence Interval Values (5)

State Lower Limit: 4,285,050,738 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,477,570,854 (Within Confidence Interval)
State Upper Limit: 4,736,108,710 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,636,012,728 (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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