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2007 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 940,991,259 1.0343 909,785,612 26 6,107 .011335912
A 940,260,512 1.0046 935,955,118 24 4,466 .007583516
A 940,322,629 0.9747 964,730,306 23 3,209 .005671729
A 940,444,265 0.9595 980,139,932 23 1,750 .038992393
D3 256,626,724 1.0190 251,841,731 18 2,081 .024530345
F1 151,505,734 1.0313 146,907,528 10 287 .031178782
F1 151,258,223 1.0265 147,353,359 8 89 .025625820
F1 151,480,094 1.0077 150,322,610 7 35 .027724289
F1 151,084,359 1.0139 149,013,077 6 11 .014820340
Random Totals: 4,623,973,799   4,636,049,273 145 18,035  
Catg D1 Exception Values: 2,847,440   2,579,271      
Total Test Values (4): 4,626,821,239   4,638,628,544      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 231,931,427

Confidence Interval Values (5)

State Lower Limit: 4,406,697,117 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,626,821,239 (Within Confidence Interval)
State Upper Limit: 4,870,559,971 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,203,356,036 (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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