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Sample Size

Size of sample needed to yield error of 5% or less in 95 out of 100 samples

Population Size

Obtained
Sample Size
Percent of
Population
50 45 90
100 80 80
200 132 66
300 168 56
400 196 49
500 218 43
600 234 39
800 240 32
1,000 278 27
2,000 323 16
3,000 341 11
5,000 357 7
6,000 361 6
8,000 367 4
10,000 370 3
15,000 375 2
20,000 377 1.8
30,000 379 1.2
50,000 381 0.7
75,000 382 0.4
100,000 383 0.03

Source: Michigan State Univeristy OMERAD Medical Education Section

Education Resources
1301 N Columbia Rd Stop 9037
Suite E438
Grand Forks, ND 58202-9037
P 701.777.3800
F 701.777.6290
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    School of Medicine & Health Sciences

    1301 N Columbia Rd Stop 9037
    Grand Forks, ND 58202-9037

    701.777.2514

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