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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 0.9627 292,337,168 15 6,158 .014289421
A 281,162,326 0.8707 322,915,270 17 4,080 .013769479
A 281,196,264 0.9237 304,423,800 22 2,988 .021628628
A 281,100,092 0.9661 290,963,764 9 1,844 .008628467
B 36,118,341 0.9385 38,485,180 7 235 .016308753
B 36,106,878 0.9467 38,139,725 8 143 .007494777
B 35,856,509 0.9585 37,408,982 7 84 .030726309
B 35,742,799 0.9564 37,372,228 6 36 .001307966
F1 152,023,502 0.9049 168,000,334 7 993 .006729622
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   2,174,454,291 141 18,169  
Catg D1 Exception Values: 1,570   2,074      
Total Test Values (4): 2,049,791,251   2,174,456,365      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 108,722,818

Confidence Interval Values (5)

Local Test Value: 2,049,791,251 (Outside Confidence Interval)
State Lower Limit: 2,065,733,547 (State Test Value minus Margin of Error Percent)
State Upper Limit: 2,283,179,183 (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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