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2009 Confidence Interval Detail
199/Rockwall
199-902/Royse City ISD

Category Summary

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

Stratum
Variance
A 148,517,984 1.0332 143,745,629 26 1,358 .017056722
A 151,649,203 0.9999 151,664,369 22 1,098 .004308778
A 153,988,523 1.0379 148,365,472 27 909 .006618500
A 146,165,659 1.0412 140,381,924 11 573 .013992413
D3 70,661,902 0.9486 74,490,725 10 1,094 .094369903
F1 11,392,970 1.0066 11,318,269 6 73 .004832225
F1 13,401,027 0.9558 14,020,744 7 31 .018183473
F1 13,722,810 0.9825 13,967,237 5 16 .003997533
F1 16,594,830 0.9677 17,148,734 4 7 .009156376
Random Totals: 726,094,908   715,103,103 118 5,159  
Catg J Exception Values: 35,118,352   34,574,126      
Catg D1 Exception Values: 1,994,377   2,047,550      
Total Test Values (4): 763,207,637   751,724,779      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 37,586,239

Confidence Interval Values (5)

State Lower Limit: 714,138,540 (State Test Value minus Margin of Error Percent)
Local Test Value: 763,207,637 (Within Confidence Interval)
State Upper Limit: 789,311,018 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 797,759,338 (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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