Those who conducting research might use Krejcie & Morgan for sampling size purposes.
Table for Determining the Random Sample Size from a Determined Population:
If your population
is:
|
Then your random sample size should be:
|
If your population
is: |
Then your random sample size should be:
|
10
|
10
|
440
|
205
|
15
|
14
|
460
|
210
|
20
|
19
|
480
|
214
|
25
|
24
|
500
|
217
|
30
|
28
|
550
|
226
|
35
|
32
|
600
|
234
|
40
|
36
|
650
|
242
|
45
|
40
|
700
|
248
|
50
|
44
|
750
|
254
|
55
|
48
|
800
|
260
|
60
|
52
|
850
|
265
|
65
|
56
|
900
|
269
|
70
|
59
|
950
|
274
|
75
|
63
|
1,000
|
278
|
80
|
66
|
1,100
|
285
|
85
|
70
|
1,200
|
291
|
90
|
73
|
1,300
|
297
|
95
|
76
|
1,400
|
302
|
100
|
80
|
1,500
|
306
|
110
|
86
|
1,600
|
310
|
120
|
92
|
1,700
|
313
|
130
|
97
|
1,800
|
317
|
140
|
103
|
1,900
|
320
|
150
|
108
|
2,000
|
322
|
160
|
113
|
2,200
|
327
|
170
|
118
|
2,400
|
331
|
180
|
123
|
2,600
|
335
|
190
|
127
|
2,800
|
338
|
200
|
132
|
3,000
|
341
|
210
|
136
|
3,500
|
346
|
220
|
140
|
4,000
|
351
|
230
|
144
|
4,500
|
354
|
240
|
148
|
5,000
|
357
|
250
|
152
|
6,000
|
361
|
260
|
155
|
7,000
|
364
|
270
|
159
|
8,000
|
367
|
280
|
162
|
9,000
|
368
|
290
|
165
|
10,000
|
370
|
300
|
169
|
15,000
|
375
|
320
|
175
|
20,000
|
377
|
340
|
181
|
30,000
|
379
|
360
|
186
|
40,000
|
380
|
380
|
191
|
50,000
|
381
|
400
|
196
|
75,000
|
382
|
420
|
201
|
1,000,000
|
384
|
Derived from: Krejcie, R. V., & Morgan, D. W. (1970). Determining sample size for research activities. Educational and Psychological Measurement, 30, 607-610.
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