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2008 Confidence Interval Detail
227/Travis
246-909/Round Rock ISD

Category Summary

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

Stratum
Variance
A 3,419,629,942 0.9564 3,575,522,733 60 12,017 .008018834
B 567,189,688 0.8780 646,001,923 16 311 .076147832
F1 967,985,596 0.8260 1,171,895,395 12 372 .061095556
L1 513,302,737 0.9923 517,285,838 10 1,158 .000407618
Random Totals: 5,468,107,963   5,910,705,889 98 13,858  
Catg D1 Exception Values: 237,421   175,272      
Total Test Values (4): 5,468,345,384   5,910,881,161      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 295,544,058

Confidence Interval Values (5)

Local Test Value: 5,468,345,384 (Outside Confidence Interval)
State Lower Limit: 5,615,337,103 (State Test Value minus Margin of Error Percent)
State Upper Limit: 6,206,425,219 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,585,261,178 (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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