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2011 Confidence Interval Detail
220/Tarrant
220-906/Grapevine-Colleyville ISD

Category Summary

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

Stratum
Variance
A 1,299,429,543 0.9593 1,354,560,141 50 7,273 .017485127
A 1,346,254,016 0.9767 1,378,370,038 50 4,999 .006449151
A 1,393,326,950 0.9769 1,426,273,877 50 3,641 .007398798
A 1,302,402,095 0.9725 1,339,230,946 50 1,837 .007706794
B 139,876,836 1.0223 136,825,625 10 725 .006893452
B 126,628,012 0.8610 147,070,862 6 13 .008041376
B 96,435,953 0.9147 105,429,051 4 5 .014490376
B 318,763,709 0.9436 337,816,563 3 10 .001359340
F1 587,002,811 0.9915 592,035,109 10 571 .015233434
F1 531,471,194 0.8939 594,553,299 9 152 .015188224
F1 655,403,142 0.8816 743,424,617 8 58 .011335961
F1 564,719,629 0.8875 636,303,807 2 3 .026182384
L1 518,931,545 1.0493 494,550,219 10 656 .001898681
L1 539,186,002 0.9768 551,992,222 8 31 .002879021
L1 455,116,495 1.0074 451,773,372 4 6 .000597418
Random Totals: 9,874,947,932   10,290,209,748 274 19,980  
Catg D1 Exception Values: 92,135   63,507      
Catg L1 Exception Values: 390,857,857   391,566,003      
Total Test Values (4): 10,265,897,924   10,681,839,258      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 534,091,963

Confidence Interval Values (5)

State Lower Limit: 10,147,747,295 (State Test Value minus Margin of Error Percent)
Local Test Value: 10,265,897,924 (Within Confidence Interval)
State Upper Limit: 11,215,931,221 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 9,885,213,092 (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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