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2009 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 423,431,980 1.0854 390,116,068 25 4,847 .023104518
A 508,655,860 1.0063 505,471,390 23 4,248 .010960266
A 508,347,840 1.0290 494,021,224 24 3,287 .015429018
A 426,129,560 1.0519 405,104,630 24 1,742 .013707172
B 47,989,490 0.9281 51,707,241 7 222 .009048709
B 56,139,060 0.9489 59,162,251 4 11 .002347306
B 13,526,680 1.0117 13,370,248 2 2 .000004038
B 67,388,910 0.9903 68,048,985 3 8 .001944026
F1 151,097,910 0.8962 168,598,427 8 390 .019498066
F1 157,884,340 0.8182 192,965,461 8 132 .038322261
F1 126,873,180 0.8267 153,469,433 6 45 .017400302
F1 135,208,620 0.8921 151,562,179 5 18 .010480379
L1 60,233,840 1.0289 58,541,977 7 383 .007651792
L1 67,425,710 1.0141 66,488,226 6 66 .005462653
L1 54,280,870 0.9583 56,642,878 5 17 .056144770
L1 70,367,050 1.0248 68,664,178 4 9 .000022830
Random Totals: 2,874,980,900   2,903,934,796 161 15,427  
Catg D1 Exception Values: 109,898   110,433      
Total Test Values (4): 2,875,090,798   2,904,045,229      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 145,202,261

Confidence Interval Values (5)

State Lower Limit: 2,758,842,968 (State Test Value minus Margin of Error Percent)
Local Test Value: 2,875,090,798 (Within Confidence Interval)
State Upper Limit: 3,049,247,490 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 3,284,410,191 (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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