Table 4
Calculation of Parameters Needed to Determine d, β, and the Power of the Test
D
d=
β from
SD
D
SD
n
Station
Table
Power
HPKW
2.3
4.0
0.58
2
0.94
0.06
IHR
0.1
0.5
0.20
3
0.96
0.04
KLAW
0.5
0.5
1.0
4
0.74
0.26
LGNW
0.4
1.8
0.22
14
0.90
0.10
LGSW
3.0
7.8
0.38
14
0.76
0.24
MCQO
1.1
1.4
0.79
4
0.79
0.21
MCQW
0.7
2.2
0.32
4
0.93
0.07
TDA
0.1
0.8
0.13
2
0.97
0.03
TDAB
0.3
0.7
0.43
2
0.95
0.05
WANO
0.1
0.2
0.50
3
0.92
0.08
WRNB
0.5
0.9
0.56
7
0.72
0.28
WRNO
0.5
0.8
0.63
7
0.68
0.32
Table 5
Determination of Sample Size Needed to Obtain Desired Power of 0.8
D
d=
SD
n
Station
HPKW
0.58
28
IHR
0.20
300
KLAW
1.0
10
LGNW
0.22
300
LGSW
0.38
75
MCQO
0.79
15
MCQW
0.32
75
TDA
0.13
400
TDAB
0.43
50
WANO
0.50
32
WRNB
0.56
30
WRNO
0.63
25
12
Water Quality Technical Note AM-03 (January 1998)
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