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2010 Confidence Interval Detail
057/Dallas
057-910/Grand Prairie ISD

Category Summary

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

Stratum
Variance
A 735,338,250 0.9751 754,115,732 25 9,639 .007051589
A 723,439,260 0.9870 732,967,842 25 6,679 .003868742
A 664,156,200 1.0251 647,894,059 25 4,809 .004087123
A 658,737,340 1.0246 642,921,472 25 3,480 .003060184
B 21,118,850 0.9411 22,440,601 12 294 .039904076
B 65,358,870 1.0270 63,640,574 9 87 .008276646
B 29,708,710 0.9001 33,006,010 5 5 .011080127
F1 220,975,170 0.7507 294,358,825 10 514 .389269421
F1 201,799,080 0.9424 214,133,149 9 110 .007978134
F1 249,713,570 1.0131 246,484,621 9 38 .001053526
F1 156,927,650 0.9960 157,557,882 6 10 .006342425
L1 150,329,260 0.9919 151,556,871 10 438 .018094263
L1 143,369,400 1.1218 127,802,995 8 46 .008939034
L1 206,012,790 1.0076 204,458,902 6 17 .004645225
L1 138,707,570 1.0451 132,721,816 3 5 .000901774
Random Totals: 4,365,691,970   4,426,061,351 187 26,171  
Catg J Exception Values: 117,420,040   123,613,151      
Catg D1 Exception Values: 147,952   141,359      
Catg B Exception Values: 62,600,000   65,414,800      
Total Test Values (4): 4,545,859,962   4,615,230,661      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 230,761,533

Confidence Interval Values (5)

State Lower Limit: 4,384,469,128 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,545,859,962 (Within Confidence Interval)
State Upper Limit: 4,845,992,194 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,663,419,158 (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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