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2009 Confidence Interval Detail
039/Clay
039-903/Petrolia ISD

Category Summary

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

Stratum
Variance
A 10,889,790 1.0437 10,433,832 10 268 .024354144
A 11,632,470 0.9315 12,487,890 7 149 .002752611
A 10,775,760 0.9073 11,876,733 7 84 .006566344
A 13,926,000 1.0059 13,844,319 10 72 .008030064
D3 21,477,730 0.9669 22,212,980 18 1,335 .009890117
G1 1,046,170 1.1100 942,495 5 21 .031383620
G1 1,176,080 1.0308 1,140,939 4 8 .002155168
G1 1,217,280 0.9676 1,258,041 2 3 .004509682
Random Totals: 72,141,280   74,197,229 63 1,940  
Catg J Exception Values: 4,004,870   4,452,024      
Catg D1 Exception Values: 8,285,910   8,187,630      
Catg G1 Exception Values: 594,290   631,066      
Total Test Values (4): 85,026,350   87,467,949      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 4,373,397

Confidence Interval Values (5)

State Lower Limit: 83,094,552 (State Test Value minus Margin of Error Percent)
Local Test Value: 85,026,350 (Within Confidence Interval)
State Upper Limit: 91,841,346 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 87,865,365 (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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