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2009 Confidence Interval Detail
113/Houston
113-902/Grapeland ISD

Category Summary

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

Stratum
Variance
A 16,567,370 0.9344 17,730,490 8 413 .003158742
A 15,891,140 0.9367 16,965,026 8 225 .004324790
A 16,789,570 0.9036 18,580,755 9 163 .009512737
A 18,666,720 1.0221 18,263,105 7 91 .002063355
D3 72,537,690 1.0249 70,775,383 27 4,208 .046070418
G1 8,111,191 1.0167 7,977,959 5 12 .000648013
G1 6,759,849 1.1509 5,873,533 3 5 .033353572
G1 9,840,601 1.1575 8,501,599 3 4 .114618309
Random Totals: 165,164,131   164,667,850 70 5,121  
Catg J Exception Values: 8,160,498   8,085,466      
Catg D1 Exception Values: 15,939,280   17,186,234      
Catg G1 Exception Values: 15,261,810   14,931,652      
Total Test Values (4): 204,525,719   204,871,202      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 10,243,560

Confidence Interval Values (5)

State Lower Limit: 194,627,642 (State Test Value minus Margin of Error Percent)
Local Test Value: 204,525,719 (Within Confidence Interval)
State Upper Limit: 215,114,762 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 263,148,958 (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

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