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2006 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 933,496,311 1.0211 914,206,553 48 9,807 .002468057
A 933,340,035 1.0173 917,467,841 47 7,879 .003264073
A 932,962,609 1.0151 919,084,434 49 6,158 .002150032
A 933,181,101 0.9827 949,609,343 49 2,865 .004793921
B 244,899,101 1.0003 244,825,653 21 522 .000400825
B 243,698,435 0.9915 245,787,630 7 50 .005660436
B 250,235,924 0.9310 268,781,873 6 27 .042313219
B 232,526,005 0.9574 242,872,368 7 11 .029737478
F1 599,166,449 1.0031 597,314,773 14 841 .013436604
F1 598,982,386 0.9917 603,995,549 9 178 .002973126
F1 603,935,379 1.0133 596,008,466 8 56 .013726996
F1 588,413,719 1.0129 580,919,853 7 14 .000376853
L1 249,710,825 1.1086 225,248,805 7 1,221 .005220151
L1 250,334,791 1.0800 231,791,473 7 216 .012813916
L1 250,876,110 1.1409 219,893,163 8 74 .014171813
L1 247,461,976 1.0953 225,930,773 7 18 .009133834
Random Totals: 8,093,221,156   7,983,738,550 301 29,937  
Catg D1 Exception Values: 108,044   85,129      
Total Test Values (4): 8,093,329,200   7,983,823,679      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 399,191,184

Confidence Interval Values (5)

State Lower Limit: 7,584,632,495 (State Test Value minus Margin of Error Percent)
Local Test Value: 8,093,329,200 (Within Confidence Interval)
State Upper Limit: 8,383,014,863 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 8,621,913,824 (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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