Power of t test of m1 = m2 at a1 = .01
d |
||||||||||||
n |
dc |
.10 |
.20 |
.30 |
.40 |
.50 |
.60 |
.70 |
.80 |
1.00 |
1.20 |
1.40 |
8 |
1.31 |
02 |
03 |
04 |
05 |
08 |
12 |
14 |
19 |
30 |
43 |
57 |
9 |
1.22 |
02 |
03 |
04 |
06 |
09 |
13 |
16 |
22 |
35 |
49 |
63 |
10 |
1.14 |
02 |
03 |
04 |
07 |
10 |
14 |
18 |
25 |
40 |
55 |
70 |
11 |
1.08 |
02 |
03 |
05 |
07 |
11 |
15 |
21 |
28 |
45 |
61 |
76 |
12 |
1.02 |
02 |
03 |
05 |
08 |
12 |
17 |
23 |
31 |
49 |
66 |
81 |
13 |
.98 |
02 |
03 |
05 |
08 |
13 |
19 |
26 |
34 |
53 |
71 |
85 |
14 |
.94 |
02 |
03 |
06 |
09 |
14 |
20 |
28 |
38 |
57 |
75 |
88 |
15 |
.90 |
02 |
04 |
06 |
10 |
15 |
22 |
31 |
41 |
61 |
79 |
90 |
16 |
.87 |
02 |
04 |
06 |
10 |
16 |
24 |
34 |
44 |
64 |
82 |
92 |
17 |
.84 |
02 |
04 |
07 |
11 |
18 |
26 |
36 |
47 |
68 |
85 |
94 |
18 |
.81 |
02 |
04 |
07 |
12 |
19 |
27 |
38 |
49 |
71 |
87 |
95 |
19 |
.79 |
02 |
04 |
07 |
13 |
20 |
29 |
40 |
51 |
74 |
89 |
96 |
20 |
.77 |
02 |
04 |
08 |
13 |
21 |
30 |
42 |
54 |
76 |
91 |
97 |
21 |
.75 |
02 |
05 |
08 |
14 |
22 |
32 |
44 |
56 |
79 |
93 |
98 |
22 |
.73 |
02 |
05 |
08 |
15 |
23 |
34 |
46 |
59 |
81 |
94 |
98 |
23 |
.71 |
02 |
05 |
09 |
15 |
24 |
36 |
48 |
61 |
83 |
95 |
99 |
24 |
.70 |
02 |
05 |
09 |
16 |
25 |
37 |
50 |
64 |
85 |
95 |
99 |
25 |
.68 |
02 |
05 |
10 |
17 |
27 |
39 |
53 |
66 |
87 |
96 |
99 |
26 |
.67 |
02 |
05 |
10 |
17 |
28 |
41 |
55 |
68 |
89 |
97 |
99 |
27 |
.65 |
02 |
05 |
10 |
18 |
29 |
42 |
57 |
70 |
90 |
97 |
* |
28 |
.64 |
02 |
05 |
11 |
19 |
30 |
44 |
59 |
72 |
91 |
98 |
|
29 |
.63 |
02 |
06 |
11 |
19 |
31 |
46 |
60 |
74 |
92 |
98 |
|
30 |
.62 |
03 |
06 |
11 |
20 |
32 |
48 |
62 |
75 |
93 |
99 |
|
31 |
.61 |
03 |
06 |
12 |
21 |
34 |
50 |
64 |
77 |
94 |
99 |
|
32 |
.60 |
03 |
06 |
12 |
22 |
35 |
51 |
66 |
79 |
94 |
99 |
|
33 |
.59 |
03 |
06 |
13 |
22 |
36 |
52 |
67 |
80 |
95 |
99 |
|
34 |
.58 |
03 |
06 |
13 |
23 |
37 |
53 |
69 |
81 |
95 |
99 |
|
35 |
.57 |
03 |
07 |
13 |
24 |
38 |
55 |
70 |
83 |
96 |
* |
|
36 |
.56 |
03 |
07 |
14 |
25 |
40 |
56 |
72 |
84 |
96 |
||
37 |
.55 |
03 |
07 |
14 |
26 |
41 |
58 |
73 |
85 |
97 |
||
38 |
.55 |
03 |
07 |
15 |
26 |
42 |
60 |
75 |
86 |
97 |
||
39 |
.54 |
03 |
07 |
15 |
27 |
43 |
61 |
76 |
87 |
98 |
||
40 |
.53 |
03 |
07 |
15 |
28 |
45 |
62 |
78 |
88 |
98 |
||
42 |
.52 |
03 |
08 |
16 |
30 |
47 |
64 |
80 |
90 |
98 |
||
44 |
.51 |
03 |
08 |
17 |
31 |
49 |
67 |
82 |
91 |
99 |
||
46 |
.49 |
03 |
08 |
18 |
33 |
51 |
69 |
83 |
93 |
99 |
||
48 |
.48 |
03 |
08 |
19 |
34 |
53 |
71 |
85 |
94 |
99 |
||
* Power values below this point are greater than .995.
(Source: Cohen, 1977)