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2008 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 936,968,227 0.9759 960,106,801 56 6,486 .005884082
A 976,733,989 0.9938 982,827,520 63 4,934 .008930385
A 991,112,445 0.9714 1,020,292,820 63 3,577 .003949836
A 1,037,478,385 0.9643 1,075,887,571 61 1,991 .005796613
D3 270,506,607 0.8606 314,323,271 15 2,043 .092717038
F1 168,671,054 0.9215 183,039,668 7 315 .034276274
F1 162,189,559 0.9687 167,430,122 7 97 .017279234
F1 162,970,360 0.9932 164,086,146 6 35 .003699674
F1 255,675,080 1.0357 246,862,103 4 12 .004260803
Random Totals: 4,962,305,706   5,114,856,022 282 19,490  
Catg D1 Exception Values: 2,744,020   2,479,660      
Total Test Values (4): 4,965,049,726   5,117,335,682      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 255,866,784

Confidence Interval Values (5)

State Lower Limit: 4,861,468,898 (State Test Value minus Margin of Error Percent)
Local Test Value: 4,965,049,726 (Within Confidence Interval)
State Upper Limit: 5,373,202,466 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,579,585,454 (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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