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2006 Confidence Interval Detail
199/Rockwall
199-901/Rockwall ISD

Category Summary

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

Stratum
Variance
A 857,884,205 1.0070 851,920,760 58 5,661 .005747069
A 857,691,460 1.0362 827,727,717 60 4,116 .005857307
A 857,916,156 1.0249 837,073,037 60 3,008 .008931812
A 857,531,657 1.0102 848,873,151 57 1,654 .006424558
F1 133,127,842 1.0666 124,815,153 8 253 .036179106
F1 133,164,120 1.1737 113,456,693 6 80 .017530310
F1 130,954,362 1.0595 123,600,153 6 31 .003615134
F1 132,285,300 0.9211 143,616,654 7 10 .005921355
Random Totals: 3,960,555,102   3,871,083,318 262 14,813  
Catg D1 Exception Values: 2,922,020   2,696,271      
Total Test Values (4): 3,963,477,122   3,873,779,589      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 193,688,979

Confidence Interval Values (5)

State Lower Limit: 3,680,090,610 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,963,477,122 (Within Confidence Interval)
State Upper Limit: 4,067,468,568 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,727,504,650 (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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