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2008 Confidence Interval Detail
057/Dallas
057-916/Richardson ISD

Category Summary

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

Stratum
Variance
A 2,266,501,930 0.9937 2,280,871,420 63 17,192 .002219049
A 2,318,744,240 1.0100 2,295,786,376 71 12,484 .004551220
A 2,316,364,260 0.9904 2,338,816,902 74 9,286 .002074088
A 2,726,655,470 0.9881 2,759,493,442 74 6,891 .004987814
B 295,070,880 1.0483 281,475,608 15 633 .003176570
B 355,671,130 0.9496 374,548,368 6 64 .007815727
B 338,107,050 1.0144 333,307,423 6 30 .002464335
B 321,619,920 0.9176 350,501,221 4 11 .014010635
F1 1,164,199,900 0.9103 1,278,918,928 12 818 .018091236
F1 1,158,368,210 0.7428 1,559,461,780 7 239 .022254450
F1 1,210,877,750 0.9013 1,343,479,141 6 88 .012386053
F1 1,146,770,600 0.9415 1,218,025,066 5 21 .006059412
L1 337,057,720 1.1328 297,543,891 7 2,298 .053302192
L1 333,512,350 1.1291 295,378,930 7 346 .006275260
L1 349,483,870 1.0624 328,956,956 8 111 .003833654
L1 380,771,910 0.8907 427,497,373 5 25 .019906941
Random Totals: 17,019,777,190   17,764,062,825 370 50,537  
Catg D1 Exception Values: 6,359   7,422      
Total Test Values (4): 17,019,783,549   17,764,070,247      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 888,203,512

Confidence Interval Values (5)

State Lower Limit: 16,875,866,735 (State Test Value minus Margin of Error Percent)
Local Test Value: 17,019,783,549 (Within Confidence Interval)
State Upper Limit: 18,652,273,759 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 17,419,956,054 (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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