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2011 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 307,664,139 1.0435 294,838,657 38 6,089 .068646666
A 313,445,531 1.1039 283,943,773 30 4,169 .053039813
A 308,559,410 1.0624 290,436,192 21 2,997 .061741697
A 319,133,612 1.1019 289,621,211 21 1,865 .033178453
B 42,886,675 1.0922 39,266,320 12 287 .015889925
B 41,035,780 1.0566 38,837,573 14 176 .036426984
B 42,956,960 1.0301 41,701,738 11 109 .027869301
B 42,694,008 0.9835 43,410,278 8 46 .002702219
F1 167,875,440 1.0222 164,229,544 19 1,100 .175701163
F1 164,876,537 0.8867 185,943,991 15 381 .162045202
F1 161,114,708 1.1070 145,541,742 10 146 .046506225
F1 149,190,133 0.9941 150,075,579 5 11 .007428552
L1 39,923,030 1.0288 38,805,434 10 769 .012442157
L1 42,698,350 1.0118 42,200,385 9 189 .001793132
L1 48,447,160 0.9498 51,007,749 8 59 .034749914
L1 29,799,550 0.8952 33,288,148 5 6 .000984403
Random Totals: 2,222,301,023   2,133,148,314 236 18,399  
Catg D1 Exception Values: 1,630   2,884      
Total Test Values (4): 2,222,302,653   2,133,151,198      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 106,657,560

Confidence Interval Values (5)

State Lower Limit: 2,026,493,638 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,222,302,653 (Within Confidence Interval)
State Upper Limit: 2,239,808,758 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,168,185,662 (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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