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2007 Confidence Interval Detail
240/Webb
240-901/Laredo ISD

Category Summary

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

Stratum
Variance
A 281,432,992 0.9796 287,293,785 13 6,158 .014211099
A 281,162,326 0.8847 317,805,274 16 4,080 .012793371
A 281,196,264 0.9343 300,969,993 19 2,988 .023221890
A 281,100,092 0.9744 288,485,316 9 1,844 .006996712
B 36,118,341 0.9385 38,485,180 7 235 .016308753
B 36,106,878 0.9745 37,051,696 7 143 .001024292
B 35,856,509 0.9995 35,874,446 7 84 .026274527
B 35,742,799 0.9612 37,185,600 6 36 .000708497
F1 152,023,502 0.9241 164,509,795 6 993 .003841724
F1 152,108,944 0.9722 156,458,490 7 346 .005268153
F1 152,338,011 0.9630 158,191,081 7 124 .000669189
F1 150,822,203 0.9832 153,399,311 4 9 .001099938
L1 43,532,779 0.9974 43,646,259 8 841 .002851914
L1 43,675,970 1.0543 41,426,510 7 210 .005732735
L1 43,743,171 0.9429 46,392,164 6 66 .023233054
L1 42,828,900 0.9540 44,894,025 4 12 .004363179
Random Totals: 2,049,789,681   2,152,068,925 133 18,169  
Catg D1 Exception Values: 1,570   2,074      
Total Test Values (4): 2,049,791,251   2,152,070,999      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 107,603,550

Confidence Interval Values (5)

State Lower Limit: 2,044,467,449 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,049,791,251 (Within Confidence Interval)
State Upper Limit: 2,259,674,549 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,033,691,119 (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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