taxes Property Tax

School and Appraisal Districts Property Value Study 2012 Report

2012 Confidence Interval Detail
057/Dallas
057-922/Coppell ISD

Category Summary

(1)
Category
(1)
Local
Value
(1)
Stratum
Ratio
(1)
State
Value
(2)
Sample
Size
(3)
Total
Parcels

Stratum
Variance
A 862,532,100 0.9969 865,214,264 10 4,349 .006291047
A 847,800,740 0.9787 866,251,906 10 3,016 .001207901
A 853,660,840 0.9859 865,869,601 10 2,427 .003598067
A 897,848,760 1.0376 865,312,992 10 1,622 .003506416
F1 474,684,240 0.9048 524,628,912 9 182 .024086008
F1 450,442,640 0.8744 515,144,831 9 72 .003628636
F1 533,267,740 0.9432 565,381,404 8 45 .005781695
F1 626,822,240 1.0017 625,758,451 7 28 .003708979
L1 344,036,140 1.0329 333,077,878 10 327 .008235355
L1 403,556,900 1.1162 361,545,332 9 82 .020830172
L1 355,611,500 1.0242 347,209,041 7 30 .001749965
L1 578,308,070 1.0202 566,857,548 5 18 .001837112
Random Totals: 7,228,571,910   7,302,252,160 104 12,198  
Catg D1 Exception Values: 229,385   103,467      
Total Test Values (4): 7,228,801,295   7,302,355,627      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 365,117,781

Confidence Interval Values (5)

State Lower Limit: 6,937,237,846 (State Test Value minus Margin of Error Percent)
Local Test Value: 7,228,801,295 (Within Confidence Interval)
State Upper Limit: 7,667,473,408 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,419,164,969 (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