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2009 Confidence Interval Detail
170/Montgomery
170-902/Conroe ISD

Category Summary

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

Stratum
Variance
A 3,239,436,625 0.9489 3,413,886,210 51 25,510 .013164811
A 3,451,471,562 0.9793 3,524,427,205 30 16,662 .003401117
A 3,354,352,565 0.9596 3,495,573,744 27 9,929 .006628415
A 3,749,345,435 0.9351 4,009,566,287 28 5,233 .009016325
B 162,399,742 0.9562 169,838,676 6 38 .002947195
B 111,270,630 0.9601 115,894,834 5 13 .000691102
B 116,659,440 0.9197 126,845,102 6 9 .006354520
B 270,471,340 0.9633 280,775,812 4 15 .001349684
C 134,759,626 0.9995 134,827,040 10 5,971 .029570254
C 158,101,608 0.9654 163,767,980 19 2,515 .015516146
C 142,526,208 1.0867 131,155,064 7 465 .014589911
C 144,448,390 1.0814 133,575,356 6 73 .023811615
D3 238,075,422 0.9035 263,503,511 11 4,280 .052348892
F1 699,602,485 1.0169 687,975,696 7 1,257 .024530883
F1 692,132,938 0.9912 698,277,782 8 274 .008609118
F1 787,912,700 1.0157 775,733,681 6 102 .005975283
F1 691,612,860 0.9716 711,828,798 5 24 .003868502
L1 331,693,489 0.8680 382,135,356 8 2,579 .030035602
L1 348,632,073 0.8610 404,915,300 8 430 .049761682
L1 374,689,268 0.8654 432,966,568 7 113 .053517874
L1 348,666,490 0.8525 408,992,950 5 20 .086185050
Random Totals: 19,548,260,896   20,466,462,952 264 75,512  
Catg D1 Exception Values: 47,811,741   47,204,308      
Total Test Values (4): 19,596,072,637   20,513,667,260      

Margin of Error

Margin of Error Percent: 5.0000000
Margin of Error Value: 1,025,683,363

Confidence Interval Values (5)

State Lower Limit: 19,487,983,897 (State Test Value minus Margin of Error Percent)
Local Test Value: 19,596,072,637 (Within Confidence Interval)
State Upper Limit: 21,539,350,623 (State Test Value plus Margin of Error Percent)
Value Assigned (6): 19,686,233,651 (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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