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2008 Confidence Interval Detail
091/Grayson
091-913/Pottsboro ISD

Category Summary

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

Stratum
Variance
A 94,190,703 0.9132 103,143,564 13 1,566 .052553152
A 102,664,471 0.8983 114,287,511 18 851 .069956885
A 113,258,320 0.9200 123,106,870 21 587 .035600099
A 115,528,276 0.8903 129,763,311 7 311 .089781288
D3 68,064,381 1.0106 67,350,466 16 1,681 .011567321
F1 13,503,495 0.9306 14,510,525 6 116 .009222566
F1 10,510,783 0.9572 10,980,760 6 28 .006869926
G1 16,028,597 0.8476 18,910,567 7 30 .051237999
G1 14,948,601 1.0615 14,082,526 4 11 .010656770
G1 14,702,080 1.0594 13,877,742 3 5 .026665371
G1 15,032,460 1.0375 14,489,118 2 3 .015460798
Random Totals: 578,432,167   624,502,960 103 5,189  
Catg D1 Exception Values: 3,471,801   2,294,748      
Catg F1 Exception Values: 11,292,247   11,622,508      
Total Test Values (4): 593,196,215   638,420,216      

Margin of Error

Margin of Error Percent: 5.6949229
Margin of Error Value: 36,357,539

Confidence Interval Values (5)

Local Test Value: 593,196,215 (Outside Confidence Interval)
State Lower Limit: 602,062,677 (State Test Value minus Margin of Error Percent)
State Upper Limit: 674,777,755 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 632,145,097 (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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