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2009 Confidence Interval Detail
101/Harris
101-921/Tomball ISD

Category Summary

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

Stratum
Variance
A 668,861,138 0.9553 700,158,210 31 4,927 .016310433
A 604,080,841 0.9571 631,157,498 33 3,205 .010567552
A 575,224,118 0.9993 575,627,057 32 2,354 .012961359
A 714,472,784 0.9472 754,299,814 31 1,511 .017341963
F1 294,799,493 0.9646 305,618,384 7 360 .008655494
F1 269,458,281 0.9835 273,978,933 6 61 .000652928
F1 251,313,183 0.8701 288,832,528 5 13 .046902703
Random Totals: 3,378,209,838   3,529,672,424 145 12,431  
Catg D1 Exception Values: 5,343,634   4,847,353      
Catg F1 Exception Values: 129,896,929   131,360,000      
Total Test Values (4): 3,513,450,401   3,665,879,777      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 183,293,989

Confidence Interval Values (5)

State Lower Limit: 3,482,585,788 (State Test Value minus Margin of Error Percent)
Local Test Value: 3,513,450,401 (Within Confidence Interval)
State Upper Limit: 3,849,173,766 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 4,612,705,938 (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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