taxes Property Tax

School and Appraisal Districts Property Value Study 2015 Report

2015 Confidence Interval Detail
170/Montgomery
170-904/Willis ISD

Category Summary

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

Stratum
Variance
A 448,316,220 0.8503 527,244,761 61 4,515 .052980628
A 601,364,920 0.9412 638,934,254 103 3,401 .029101656
A 562,551,200 0.9075 619,891,129 36 1,894 .071016025
A 561,989,750 0.9575 586,934,465 21 947 .031086160
F1 58,784,329 1.0268 57,250,028 10 259 .005839831
F1 72,055,570 1.0424 69,124,683 9 101 .002530863
F1 59,674,860 1.0029 59,502,303 8 32 .006099850
F1 78,340,689 1.0656 73,517,914 5 17 .016220251
L1 41,520,623 1.0791 38,477,086 10 220 .035364566
L1 34,997,327 1.0288 34,017,620 8 29 .005347135
L1 47,392,721 1.0304 45,994,489 5 9 .008720735
Random Totals: 2,566,988,209   2,750,888,732 276 11,424  
Catg D1 Exception Values: 25,313,205   25,139,307      
Catg L1 Exception Values: 29,255,830   27,874,218      
Total Test Values (4): 2,621,557,244   2,803,902,257      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 140,195,112

Confidence Interval Values (5)

Local Test Value: 2,621,557,244 (Outside Confidence Interval)
State Lower Limit: 2,663,707,145 (State Test Value minus Margin of Error Percent)
State Upper Limit: 2,944,097,369 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,680,753,015 (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