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2011 Confidence Interval Detail
220/Tarrant
220-907/Keller ISD

Category Summary

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

Stratum
Variance
A 2,206,608,873 1.0068 2,191,705,277 75 17,244 .004952629
A 2,205,460,052 0.9833 2,242,916,762 75 11,734 .007463915
A 2,142,137,173 0.9770 2,192,566,195 75 7,709 .006802059
A 2,216,426,795 0.9868 2,246,074,985 75 3,996 .008342936
B 41,089,430 0.8942 45,951,051 9 90 .006976009
B 110,381,423 0.8751 126,135,782 5 9 .003877979
B 36,559,700 0.8619 42,417,566 2 2 .005215828
B 224,035,260 0.8756 255,864,847 2 9 .002969985
F1 295,228,005 0.9573 308,396,537 11 344 .024296835
F1 297,143,731 0.8086 367,479,262 9 139 .006880468
F1 326,280,181 0.8747 373,019,528 8 49 .011107809
F1 290,009,083 0.9136 317,435,511 4 9 .001212690
L1 88,198,414 1.0365 85,092,536 11 715 .003236431
L1 89,182,499 1.0252 86,990,342 9 123 .009096134
L1 92,087,083 1.0544 87,336,004 8 34 .002368636
L1 102,556,532 1.0402 98,593,090 4 8 .000280163
Random Totals: 10,763,384,234   11,067,975,275 382 42,214  
Catg D1 Exception Values: 406,681   270,313      
Total Test Values (4): 10,763,790,915   11,068,245,588      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 553,412,279

Confidence Interval Values (5)

State Lower Limit: 10,514,833,309 (State Test Value minus Margin of Error Percent)
Local Test Value: 10,763,790,915 (Within Confidence Interval)
State Upper Limit: 11,621,657,867 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 11,035,743,850 (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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