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2009 Confidence Interval Detail
091/Grayson
091-906/Sherman ISD

Category Summary

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

Stratum
Variance
A 228,789,807 0.9806 233,316,140 44 4,211 .018768562
A 239,818,409 0.9920 241,752,428 51 2,594 .009317903
A 232,613,349 0.9952 233,735,278 44 1,740 .002397664
A 258,947,835 1.0076 256,994,675 47 1,051 .005766343
B 31,247,048 0.9557 32,695,457 8 279 .023779866
B 32,270,503 0.6837 47,199,800 9 46 .041386563
B 35,266,315 0.7867 44,828,162 5 9 .041707410
B 33,414,628 0.7927 42,152,930 2 3 .001763520
F1 121,070,651 0.8444 143,380,686 10 460 .082287399
F1 124,142,536 0.9840 126,161,114 8 105 .019592438
F1 127,134,896 0.8606 147,728,208 6 39 .024520774
F1 122,546,827 0.9515 128,793,302 5 11 .000886425
L1 53,831,768 1.0077 53,420,431 7 547 .003388249
L1 47,836,238 0.9399 50,895,029 7 90 .029353158
L1 63,448,751 0.9758 65,022,290 6 36 .005210271
L1 72,079,261 1.0150 71,014,050 4 11 .000470826
Random Totals: 1,824,458,822   1,919,089,980 263 11,232  
Catg D1 Exception Values: 3,360,231   2,498,095      
Total Test Values (4): 1,827,819,053   1,921,588,075      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 96,079,404

Confidence Interval Values (5)

State Lower Limit: 1,825,508,671 (State Test Value minus Margin of Error Percent)
Local Test Value: 1,827,819,053 (Within Confidence Interval)
State Upper Limit: 2,017,667,479 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 2,299,689,566 (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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