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2008 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 130,704,139 0.9915 131,824,649 39 1,267 .009179541
A 148,163,378 1.0006 148,074,533 34 1,087 .004287658
A 141,026,924 1.0389 135,746,389 24 841 .005105629
A 144,282,981 0.9769 147,694,729 19 576 .003250357
D3 71,821,533 0.9642 74,488,211 21 1,101 .018543756
Random Totals: 635,998,955   637,828,511 137 4,872  
Catg J Exception Values: 37,238,362   36,720,125      
Catg D1 Exception Values: 1,996,067   2,091,066      
Total Test Values (4): 675,233,384   676,639,702      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 33,831,985

Confidence Interval Values (5)

State Lower Limit: 642,807,717 (State Test Value minus Margin of Error Percent)
Local Test Value: 675,233,384 (Within Confidence Interval)
State Upper Limit: 710,471,687 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 760,997,784 (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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