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2020 Confidence Interval Detail

Dallas County
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 674,634,877 0.9715 694,426,019 17 4,583 0.029187592
A 907,297,036 0.9912 915,352,135 16 5,036 0.013054243
A 1,039,431,060 1.0125 1,026,598,578 28 4,724 0.009408345
A 1,098,860,220 1.0492 1,047,331,510 23 3,547 0.013144118
B 105,643,060 0.8475 124,652,578 11 343 0.000968285
B 110,520,150 0.9097 121,490,766 5 11 0.006408160
B 68,850,740 0.8206 83,902,925 4 5 0.005939894
B 136,155,560 0.9594 141,924,065 7 12 0.016787871
F1 199,869,350 0.8458 236,308,052 11 421 0.016469837
F1 201,640,670 0.8605 234,329,657 10 142 0.030840516
F1 221,423,540 0.8379 264,260,103 10 60 0.016796944
F1 246,590,170 0.8241 299,223,602 7 20 0.023308096
L1 99,019,510 1.0913 90,735,371 11 337 0.029984021
L1 120,648,550 1.0604 113,776,452 11 56 0.003860472
L1 98,904,950 1.0141 97,529,780 7 11 0.000291848
Random Totals: 5,329,489,443 5,491,841,593 178 19,308
CATG D1 EXCEPTION VALUES: 72,287 67,241
CATG L1 EXCEPTION VALUES: 86,636,150 85,170,655
Total Test Values 5,416,197,880 5,577,079,489

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 278,853,974

Confidence Interval Values(5)

Local Test Value: 5,416,197,880 WITHIN CONFIDENCE INTERVAL
State Lower Limit: 5,298,225,515 (State Test Value minus Margin of Error Percent)
State Upper Limit: 5,855,933,463 (State Test Value plus Margin of Error Percent)

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, D2, E, F1, G1, G2, or L1 marked as exception properties
(5) Unstudied categories and sub-categories were not included in the Confidence Interval Values