taxes Property Tax

School and Appraisal Districts Property Value Study 2012 Report

2012 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 668,140,050 0.9767 684,079,093 10 9,251 .002521554
A 663,041,080 1.0653 622,398,461 10 6,331 .007858785
A 683,389,380 1.0036 680,938,003 10 5,113 .001242430
A 665,487,390 1.0072 660,730,133 10 3,615 .004119213
F1 206,673,730 0.8738 236,522,923 11 532 .108287606
F1 199,628,070 0.9109 219,154,759 9 123 .014830860
F1 192,422,870 0.9402 204,661,636 7 36 .020416408
F1 245,077,580 1.0775 227,450,190 6 16 .014631826
L1 162,370,870 1.0740 151,183,305 10 401 .100690511
L1 143,643,070 1.0336 138,973,558 8 47 .019631186
L1 158,896,230 1.0079 157,650,789 6 14 .000175538
L1 217,413,130 1.0167 213,841,969 3 8 .000832646
Random Totals: 4,206,183,450   4,197,584,819 100 25,487  
Catg D1 Exception Values: 133,699   108,456      
Total Test Values (4): 4,206,317,149   4,197,693,275      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 209,884,664

Confidence Interval Values (5)

State Lower Limit: 3,987,808,611 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,206,317,149 (Within Confidence Interval)
State Upper Limit: 4,407,577,939 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,542,428,748 (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