taxes Property Tax

School and Appraisal Districts Property Value Study 2015 Report

2015 Confidence Interval Detail
220/Tarrant
061-911/Northwest ISD

Category Summary

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

Stratum
Variance
A 591,916,749 0.8979 659,223,465 75 4,220 .014615506
A 833,673,116 0.9320 894,499,052 75 4,554 .016948735
A 627,825,053 0.9101 689,841,834 75 2,462 .010222814
A 745,496,346 0.9034 825,211,807 74 1,899 .024837149
F1 220,638,580 0.9177 240,425,607 9 180 .022742952
F1 227,553,396 0.8765 259,615,968 7 24 .001878631
F1 252,569,368 0.9070 278,466,778 6 16 .001396095
G1 84,352,219 0.9548 88,345,433 11 262 .046927858
G1 85,216,150 0.9845 86,557,796 9 118 .013740823
G1 84,593,730 0.9805 86,276,114 9 69 .010969906
G1 83,074,409 0.9898 83,930,500 8 39 .016463562
L1 407,371,206 1.0221 398,562,964 9 66 .005774128
L1 448,026,823 0.9528 470,221,267 5 14 .017345126
L1 363,149,406 1.0001 363,113,095 3 3 .000000025
Random Totals: 5,055,456,551   5,424,291,680 375 13,926  
Catg D1 Exception Values: 1,614,565   977,245      
Catg F1 Exception Values: 188,368,704   210,359,677      
Catg L1 Exception Values: 392,246,312   392,876,911      
Total Test Values (4): 5,637,686,132   6,028,505,513      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 301,425,275

Confidence Interval Values (5)

Local Test Value: 5,637,686,132 (Outside Confidence Interval)
State Lower Limit: 5,727,080,238 (State Test Value minus Margin of Error Percent)
State Upper Limit: 6,329,930,788 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 5,208,580,564 (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