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2007 Confidence Interval Detail
057/Dallas
057-913/Lancaster ISD

Category Summary

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

Stratum
Variance
A 258,074,970 0.9986 258,436,781 20 2,860 .000976081
A 258,832,815 0.9700 266,837,954 19 2,169 .007519725
A 258,375,709 0.9834 262,737,146 25 1,820 .002773828
A 256,992,800 1.0196 252,052,570 24 1,365 .002785366
F1 60,732,459 0.9558 63,540,970 8 160 .014927731
F1 63,195,137 0.9310 67,878,772 7 34 .021156635
F1 60,453,377 0.7356 82,182,405 4 9 .168376167
F1 57,154,819 0.9116 62,697,256 3 4 .005452532
L1 24,951,813 1.1211 22,256,545 7 183 .015377306
L1 25,699,812 1.3150 19,543,583 7 28 .081920921
L1 29,351,133 1.0042 29,228,374 4 8 .000342687
Random Totals: 1,353,814,844   1,387,392,356 128 8,640  
Catg J Exception Values: 70,976,387   70,890,264      
Catg D1 Exception Values: 1,376,530   1,703,852      
Catg L1 Exception Values: 15,822,310   16,110,704      
Total Test Values (4): 1,441,990,071   1,476,097,176      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 73,804,859

Confidence Interval Values (5)

State Lower Limit: 1,402,292,317 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,441,990,071 (Within Confidence Interval)
State Upper Limit: 1,549,902,035 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 1,661,997,964 (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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