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2009 Confidence Interval Detail
220/Tarrant
220-906/Grapevine-Colleyville ISD

Category Summary

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

Stratum
Variance
A 1,237,702,948 0.9910 1,248,943,439 22 6,999 .002122681
A 1,344,756,678 0.9811 1,370,662,193 23 5,072 .003125127
A 1,374,457,949 0.9807 1,401,507,035 29 3,622 .003143965
A 1,356,865,199 0.9938 1,365,330,247 26 1,890 .006857870
B 154,519,266 1.0040 153,903,651 11 718 .001757691
B 182,082,806 0.9580 190,065,559 5 16 .001172246
B 191,419,969 0.8915 214,716,735 4 8 .004716202
B 103,642,240 0.9372 110,587,111 2 3 .000042439
F1 625,662,856 0.9008 694,563,561 15 532 .016159904
F1 676,434,823 0.9252 731,122,809 14 163 .013879328
F1 589,193,895 0.8781 670,987,239 12 46 .022999834
L1 543,224,582 1.0450 519,832,136 8 640 .011009741
L1 419,788,714 1.0316 406,929,734 6 28 .006709170
L1 1,095,263,490 0.9988 1,096,579,385 6 10 .000012809
Random Totals: 9,895,015,415   10,175,730,834 183 19,747  
Catg D1 Exception Values: 89,325   78,603      
Catg F1 Exception Values: 573,952,228   606,630,300      
Total Test Values (4): 10,469,056,968   10,782,439,737      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 539,121,987

Confidence Interval Values (5)

State Lower Limit: 10,243,317,750 (State Test Value minus Margin of Error Percent)
Local Test Value: 10,469,056,968 (Within Confidence Interval)
State Upper Limit: 11,321,561,724 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 10,033,282,232 (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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