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2007 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 15,798,592 1.0366 15,240,779 10 404 .007522679
A 15,785,356 0.9977 15,821,746 10 228 .011582368
A 15,794,504 0.9685 16,308,213 10 158 .004210201
A 15,763,770 0.9799 16,087,121 10 83 .000980669
D3 64,662,700 0.9875 65,481,215 27 4,097 .015432160
G1 10,959,938 1.0623 10,317,178 4 12 .016860092
G1 10,382,718 1.0293 10,087,164 3 6 .000543452
G1 10,647,622 1.0602 10,043,032 2 3 .004691788
Random Totals: 159,795,200   159,386,448 76 4,991  
Catg J Exception Values: 7,573,158   7,506,017      
Catg D1 Exception Values: 14,319,760   14,969,865      
Catg G1 Exception Values: 8,010,140   8,030,394      
Total Test Values (4): 189,698,258   189,892,724      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 9,494,636

Confidence Interval Values (5)

State Lower Limit: 180,398,088 (State Test Value minus Margin of Error Percent)
Local Test Value: 189,698,258 (Within Confidence Interval)
State Upper Limit: 199,387,360 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 235,820,501 (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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