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2009 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 3,527,344,349 1.0071 3,502,476,764 70 12,036 .004711370
B 512,717,862 1.0164 504,444,965 20 310 .003829862
F1 976,977,365 1.0646 917,694,312 20 335 .013174895
L1 496,991,721 0.9355 531,257,852 10 1,117 .012883341
Random Totals: 5,514,031,297   5,455,873,893 120 13,798  
Catg D1 Exception Values: 247,693   169,023      
Total Test Values (4): 5,514,278,990   5,456,042,916      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 272,802,146

Confidence Interval Values (5)

State Lower Limit: 5,183,240,770 (State Test Value minus Margin of Error Percent)
Local Test Value: 5,514,278,990 (Within Confidence Interval)
State Upper Limit: 5,728,845,062 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,565,817,947 (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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