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2009 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 292,819,850 0.9904 295,658,168 19 5,969 .045470529
A 305,714,787 0.9511 321,432,854 17 4,184 .020938939
A 309,031,367 0.9525 324,442,380 18 3,088 .026228113
A 318,788,080 0.9756 326,761,050 8 1,934 .006310735
B 41,459,970 0.9499 43,646,668 7 272 .000512653
B 38,678,290 0.9518 40,636,993 7 163 .004762404
B 41,627,017 0.9864 42,200,950 7 105 .018051127
B 41,499,410 0.9825 42,238,585 6 44 .005989933
F1 159,187,761 1.0155 156,758,012 7 1,037 .085900851
F1 160,433,170 0.9056 177,156,769 7 372 .004890010
F1 166,717,280 0.9718 171,555,135 7 150 .003949714
F1 156,673,780 0.9003 174,023,970 4 10 .000491767
L1 47,669,510 0.9759 48,846,716 7 901 .002282562
L1 42,731,180 1.0216 41,827,702 7 187 .002691631
L1 44,385,220 0.9797 45,304,910 7 66 .000832948
L1 50,268,950 0.9621 52,249,194 5 15 .000728868
Random Totals: 2,217,685,622   2,304,740,056 140 18,497  
Catg D1 Exception Values: 1,620   2,480      
Total Test Values (4): 2,217,687,242   2,304,742,536      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 115,237,127

Confidence Interval Values (5)

State Lower Limit: 2,189,505,409 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,217,687,242 (Within Confidence Interval)
State Upper Limit: 2,419,979,663 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,163,951,268 (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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