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2010 Confidence Interval Detail
057/Dallas
057-912/Irving ISD

Category Summary

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

Stratum
Variance
A 1,080,112,410 0.9535 1,132,787,006 24 11,973 .008606845
A 831,831,670 1.0009 831,083,695 25 7,069 .002850340
A 939,956,530 1.0022 937,893,165 25 5,813 .004588781
A 936,596,790 0.9836 952,213,085 25 2,349 .010789781
B 278,295,330 1.0545 263,912,119 19 435 .011584047
B 246,920,200 0.9160 269,563,537 8 42 .055776793
B 194,008,350 0.9840 197,162,957 7 17 .009925463
B 229,083,470 0.9435 242,801,770 4 8 .021066592
F1 673,785,880 0.9834 685,159,528 11 881 .011986132
F1 589,944,670 0.8099 728,416,681 10 164 .063612567
F1 686,060,600 0.8212 835,436,678 8 50 .017671758
F1 481,295,680 0.9100 528,896,352 6 10 .003132128
L1 272,416,170 1.1847 229,945,277 10 1,163 .036235371
L1 238,044,110 1.0969 217,015,325 10 180 .005465857
L1 276,626,010 1.0324 267,944,605 9 75 .005947194
L1 256,793,260 0.9839 260,995,284 6 16 .028232168
Random Totals: 8,211,771,130   8,581,227,064 207 30,245  
Catg J Exception Values: 176,649,876   164,528,356      
Catg D1 Exception Values: 102,264   58,984      
Total Test Values (4): 8,388,523,270   8,745,814,404      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 437,290,720

Confidence Interval Values (5)

State Lower Limit: 8,308,523,684 (State Test Value minus Margin of Error Percent)
Local Test Value: 8,388,523,270 (Within Confidence Interval)
State Upper Limit: 9,183,105,124 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 8,695,317,015 (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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