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2010 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 801,659,670 0.9907 809,185,091 49 4,131 .002870551
A 871,591,660 0.9732 895,593,568 49 3,162 .001986793
A 853,433,260 0.9670 882,557,663 50 2,447 .002532098
A 867,881,620 0.9722 892,698,642 50 1,618 .003321475
F1 599,931,520 0.8664 692,441,736 10 194 .035598213
F1 574,900,150 0.9056 634,827,904 10 72 .004061675
F1 466,569,630 0.9350 499,004,952 8 33 .005378517
F1 395,520,480 1.0113 391,101,038 7 15 .009813988
L1 389,719,530 1.0351 376,504,231 10 296 .017349681
L1 393,135,510 0.9972 394,239,380 9 63 .004667173
L1 348,085,060 1.0008 347,806,815 7 21 .002495966
L1 201,419,060 0.9513 211,730,327 5 6 .015283896
Random Totals: 6,763,847,150   7,027,691,347 264 12,058  
Catg J Exception Values: 75,103,501   72,147,147      
Catg D1 Exception Values: 216,079   146,952      
Total Test Values (4): 6,839,166,730   7,099,985,446      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 354,999,272

Confidence Interval Values (5)

State Lower Limit: 6,744,986,174 (State Test Value minus Margin of Error Percent)
Local Test Value: 6,839,166,730 (Within Confidence Interval)
State Upper Limit: 7,454,984,718 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 7,171,140,996 (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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