|
| |
The size of the population and amount of error determines the
size of a randomly selected sample. This table helps the researcher determine (with 95
percent certainty) what the results would have been if the entire population had been
surveyed.
Table for Determining the Random Sample Size
from a Determined Population
If
your Population
is:
|
Then
your random Sample size should be:
|
10
|
10
|
15
|
14
|
20
|
19
|
25
|
24
|
30
|
28
|
35
|
32
|
40
|
36
|
45
|
40
|
50
|
44
|
55
|
48
|
60
|
52
|
65
|
56
|
70
|
59
|
75
|
63
|
80
|
66
|
85
|
70
|
90
|
73
|
95
|
76
|
100
|
80
|
110
|
86
|
120
|
92
|
130
|
97
|
140
|
103
|
150
|
108
|
160
|
113
|
170
|
118
|
180
|
123
|
190
|
127
|
200
|
132
|
210
|
136
|
220
|
140
|
230
|
144
|
240
|
148
|
250
|
152
|
260
|
155
|
270
|
159
|
280
|
162
|
290
|
165
|
300
|
169
|
320
|
175
|
340
|
181
|
360
|
186
|
380
|
191
|
400
|
196
|
420
|
201
|
440
|
205
|
460
|
210
|
480
|
214
|
500
|
217
|
550
|
226
|
600
|
234
|
650
|
242
|
700
|
248
|
750
|
254
|
800
|
260
|
850
|
265
|
900
|
269
|
950
|
274
|
1,000
|
278
|
1,100
|
285
|
1,200
|
291
|
1,300
|
297
|
1,400
|
302
|
1,500
|
306
|
1,600
|
310
|
1,700
|
313
|
1,800
|
317
|
1,900
|
320
|
2,000
|
322
|
2,200
|
327
|
2,400
|
331
|
2,600
|
335
|
2,800
|
338
|
3,000
|
341
|
3,500
|
346
|
4,000
|
351
|
4,500
|
354
|
5,000
|
357
|
6,000
|
361
|
7,000
|
364
|
8,000
|
367
|
9,000
|
368
|
10,000
|
370
|
15,000
|
375
|
20,000
|
377
|
30,000
|
379
|
40,000
|
380
|
50,000
|
381
|
75,000
|
382
|
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. |
