taxes Property Tax Assistance

2017 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	757,894,150	0.9396	806,613,612	118	4,414	.006479709
A	992,085,556	0.9277	1,069,403,424	85	4,519	.008911048
A	871,873,983	0.9387	928,810,038	83	2,993	.008521557
A	1,125,130,596	0.9866	1,140,412,118	66	2,577	.024315243
F1	320,157,301	0.9275	345,183,074	9	177	.025650802
F1	296,364,302	0.9517	311,405,172	10	31	.008154561
F1	268,160,150	0.9833	272,714,482	6	17	.000570823
F1	509,079,080	0.9312	546,691,452	4	8	.013247804
L1	384,880,679	1.0266	374,908,123	12	57	.005218637
L1	386,928,901	1.0228	378,303,579	7	13	.001717797
L1	984,008,811	1.0061	978,042,750	3	7	.000017220
Random Totals:	6,896,563,509		7,152,487,824	403	14,813
Catg D1 Exception Values:	1,517,318		940,018
Catg L1 Exception Values:	582,024,127		582,024,127
Total Test Values (4):	7,480,104,954		7,735,451,969

Margin of Error

Margin of Error Percent:	5.0000000
Margin of Error Value:	386,772,598

Confidence Interval Values (5)

State Lower Limit:	7,348,679,371	(State Test Value minus Margin of Error Percent)
Local Test Value:	7,480,104,954	(Within Confidence Interval)
State Upper Limit:	8,122,224,567	(State Test Value plus Margin of Error Percent)
Value Assigned (6):	6,715,803,550	(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, D2, E, 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