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Sample sizes required per group for 90 power with a two-tailed test of the difference in two independent proportions
The proportions for the two groups are represented by the row and column proportions.
|
0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
|||||||||
0.1 |
|
269 |
85 |
45 |
28 |
20 |
15 |
11 |
9 |
|||||||||
0.2 |
|
|
395 |
111 |
54 |
32 |
22 |
15 |
11 |
|||||||||
0.3 |
|
|
|
479 |
127 |
58 |
33 |
22 |
15 |
|||||||||
0.4 |
|
|
|
|
521 |
132 |
58 |
32 |
20 |
|||||||||
0.5 |
|
|
|
|
|
521 |
127 |
54 |
28 |
|||||||||
0.6 |
|
|
|
|
|
|
479 |
111 |
45 |
|||||||||
0.7 |
|
|
|
|
|
|
|
395 |
85 |
|||||||||
0.8 |
|
|
|
|
|
|
|
|
269 |
|||||||||