taxes Property Tax

School and Appraisal Districts Property Value Study 2012 Report

2012 Confidence Interval Detail
057/Dallas
057-907/Duncanville ISD

Category Summary

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

Stratum
Variance
A 520,360,290 0.9913 524,927,156 10 6,741 .001647949
A 512,978,720 1.0104 507,698,654 10 4,624 .002296552
A 434,974,790 0.9744 446,402,699 10 3,018 .003737069
A 454,849,780 0.9589 474,345,375 10 2,076 .009412164
B 44,470,640 1.1829 37,594,590 10 149 .447607346
B 45,096,240 0.7876 57,257,796 6 10 .007853177
B 18,917,480 0.8507 22,237,546 3 3 .009779099
F1 134,386,090 0.8712 154,254,006 10 382 .036647477
F1 130,942,700 0.9176 142,701,286 9 132 .009932284
F1 134,014,040 0.8960 149,569,241 9 61 .025818252
F1 146,151,260 0.8613 169,686,822 7 25 .048968801
L1 59,456,380 1.0590 56,143,890 10 360 .032651536
L1 56,757,970 1.0233 55,465,621 9 60 .013144069
L1 55,641,850 0.9794 56,812,181 7 19 .030365130
L1 71,407,820 1.0183 70,124,541 4 8 .000441588
Random Totals: 2,820,406,050   2,925,221,404 124 17,668  
Catg D1 Exception Values: 109,791   82,647      
Catg B Exception Values: 44,025,760   49,732,000      
Total Test Values (4): 2,864,541,601   2,975,036,051      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 148,751,803

Confidence Interval Values (5)

State Lower Limit: 2,826,284,248 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,864,541,601 (Within Confidence Interval)
State Upper Limit: 3,123,787,854 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,220,213,140 (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