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2009 Confidence Interval Detail
187/Polk
187-901/Big Sandy ISD

Category Summary

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

Stratum
Variance
A 6,428,436 0.8762 7,336,722 8 264 .035307016
A 7,242,034 0.9111 7,948,671 9 149 .025501117
A 7,042,820 0.7542 9,338,133 9 92 .056567375
A 10,130,823 0.9311 10,880,489 6 76 .020057717
D3 18,282,313 1.0540 17,345,648 19 1,282 .204440288
G1 41,623,450 0.9669 43,048,350 7 21 .080433300
G1 40,728,420 1.0643 38,267,800 6 11 .001750060
G1 44,850,610 0.9199 48,755,963 5 8 .047873905
G1 35,464,960 0.8394 42,250,369 2 3 .005667402
Random Totals: 211,793,866   225,172,145 71 1,906  
Catg J Exception Values: 2,308,770   2,433,430      
Catg D1 Exception Values: 20,476,124   20,820,169      
Total Test Values (4): 234,578,760   248,425,744      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 12,421,287

Confidence Interval Values (5)

Local Test Value: 234,578,760 (Outside Confidence Interval)
State Lower Limit: 236,004,457 (State Test Value minus Margin of Error Percent)
State Upper Limit: 260,847,031 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 295,412,697 (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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