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2011 Confidence Interval Detail
084/Galveston
084-911/Friendswood ISD

Category Summary

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

Stratum
Variance
A 481,517,312 0.9560 503,679,197 22 3,159 .005869312
A 478,049,120 0.9241 517,313,191 19 1,972 .002594360
A 476,847,072 0.9507 501,574,705 21 1,471 .010495693
A 501,517,970 0.9322 537,993,961 20 922 .014868389
F1 32,218,055 1.0214 31,543,034 9 107 .005893522
F1 35,465,090 1.0618 33,400,914 8 49 .023028333
F1 35,376,200 1.0227 34,590,985 7 21 .008628859
F1 28,157,180 0.9136 30,820,031 4 6 .017708179
Random Totals: 2,069,147,999   2,190,916,018 110 7,707  
Catg D1 Exception Values: 152,841   223,753      
Total Test Values (4): 2,069,300,840   2,191,139,771      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 109,556,989

Confidence Interval Values (5)

Local Test Value: 2,069,300,840 (Outside Confidence Interval)
State Lower Limit: 2,081,582,782 (State Test Value minus Margin of Error Percent)
State Upper Limit: 2,300,696,760 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,097,313,623 (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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