taxes Property Tax

School and Appraisal Districts Property Value Study 2015 Report

2015 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 1,394,834,322 0.8913 1,564,943,702 100 7,018 .013046281
A 1,451,694,704 0.9104 1,594,567,996 100 4,922 .018439106
A 1,468,930,139 0.9014 1,629,609,651 100 3,610 .012247812
A 1,674,706,935 0.9059 1,848,666,448 100 2,391 .024776161
B 260,981,543 1.0643 245,214,266 13 564 .007046511
B 194,478,362 1.0511 185,023,653 5 9 .004121836
B 255,150,720 1.0977 232,441,213 5 7 .002961151
B 410,065,269 0.9290 441,405,026 2 8 .000627206
F1 616,091,050 0.9144 673,765,365 10 584 .019441763
F1 615,689,059 0.8825 697,664,656 9 164 .021633920
F1 598,218,982 0.8898 672,307,240 8 50 .006569358
L1 333,050,244 1.0389 320,579,694 11 461 .009765017
L1 343,500,677 1.0141 338,724,659 8 41 .020198216
L1 418,115,376 1.0008 417,781,151 5 11 .004121022
L1 369,980,137 0.8141 454,465,222 3 4 .017846147
Random Totals: 10,405,487,519   11,317,159,942 479 19,844  
Catg D1 Exception Values: 73,395   40,906      
Catg F1 Exception Values: 601,934,623   678,310,201      
Catg L1 Exception Values: 559,248,976   501,474,681      
Total Test Values (4): 11,566,744,513   12,496,985,730      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 624,849,286

Confidence Interval Values (5)

Local Test Value: 11,566,744,513 (Outside Confidence Interval)
State Lower Limit: 11,872,136,444 (State Test Value minus Margin of Error Percent)
State Upper Limit: 13,121,835,016 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 10,766,503,161 (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