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2009 Confidence Interval Detail
101/Harris
101-920/Spring Branch ISD

Category Summary

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

Stratum
Variance
A 3,214,259,559 0.9596 3,349,582,700 75 17,680 .026257564
A 3,659,758,043 0.9348 3,915,017,162 78 8,059 .018408764
A 3,669,314,918 0.9290 3,949,746,952 75 3,968 .011991352
A 3,862,965,926 0.9744 3,964,456,000 72 1,894 .016907249
B 195,187,403 0.9957 196,030,333 6 89 .001401613
B 138,951,857 1.0103 137,535,244 6 25 .003973886
B 192,107,388 0.9956 192,956,396 5 20 .003413868
B 245,569,080 0.9883 248,476,252 3 9 .003912671
C 74,606,059 0.8680 85,951,681 7 348 .039693343
C 77,529,933 0.9180 84,455,265 10 107 .018405338
C 67,611,323 0.9953 67,930,597 6 50 .003811454
C 108,721,847 0.9720 111,853,752 5 28 .001549443
F1 954,155,987 0.8160 1,169,308,808 7 856 .111057524
F1 913,495,729 0.8806 1,037,356,040 8 199 .125983270
F1 1,006,984,903 1.0605 949,537,862 7 78 .028832233
F1 1,043,299,628 0.9555 1,091,888,674 5 25 .000905900
L1 271,368,634 0.8944 303,408,580 7 2,313 .005779022
L1 277,621,859 0.9931 279,550,759 7 346 .001319848
L1 295,951,975 0.9344 316,729,425 8 111 .004167901
L1 279,133,946 0.9706 287,589,064 6 31 .012157715
Random Totals: 20,548,595,997   21,739,361,546 403 36,236  
Catg D1 Exception Values: 368,161   366,356      
Total Test Values (4): 20,548,964,158   21,739,727,902      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,086,986,395

Confidence Interval Values (5)

Local Test Value: 20,548,964,158 (Outside Confidence Interval)
State Lower Limit: 20,652,741,507 (State Test Value minus Margin of Error Percent)
State Upper Limit: 22,826,714,297 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 19,380,891,418 (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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