taxes Property Tax Assistance

2018 Confidence Interval Detail

020/Brazoria
020-901/Alvin ISD

Category Summary

(1) Category	(1) Local Value	(1) Stratum Ratio	(1) State Value	(2) Sample Size	(3) Total Parcels	Stratum Variance
A	1,336,766,754	0.9393	1,423,152,086	50	9,332	.009106652
A	1,447,574,112	0.9704	1,491,729,299	50	6,632	.010957266
A	1,523,549,568	0.9728	1,566,148,816	50	5,389	.007326473
A	1,595,629,183	1.0038	1,589,588,746	50	4,018	.007337782
B	552,152,109	0.8332	662,688,561	9	33	.008119826
E	397,895,917	0.9729	408,979,255	16	3,301	.019875611
F1	590,824,527	0.9033	654,073,427	9	689	.008879089
F1	565,869,586	0.9622	588,099,757	8	54	.057076627
L1	204,590,460	0.8573	238,645,118	16	959	.131545950
L1	102,773,230	0.9501	108,170,961	8	37	.015090182
L1	91,471,890	0.9159	99,871,045	7	10	.011412516
Random Totals:	8,409,097,336		8,831,147,071	273	30,454
Catg D1 Exception Values:	14,442,852		13,730,983
Total Test Values (4):	8,423,540,188		8,844,878,054

Margin of Error

Margin of Error Percent:	5.0000000
Margin of Error Value:	442,243,902

Confidence Interval Values (5)

State Lower Limit:	8,402,634,152	(State Test Value minus Margin of Error Percent)
Local Test Value:	8,423,540,188	(Within Confidence Interval)
State Upper Limit:	9,287,121,956	(State Test Value plus Margin of Error Percent)
Value Assigned (6):	6,839,754,662	(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