TABLE OF SAMPLE ERROR
HOMOGENEITY OF POPULATION
| SAMPLE SIZE | 50/50 | 60/40 | 70/30 | 80/20 | 90/10 |
| 100 | 10 | 9.8 | 9.2 | 8 | 6 |
| 200 | 7.1 | 6.9 | 6.5 | 5.7 | 4.2 |
| 300 | 5.8 | 5.7 | 5.3 | 4.6 | 3.5 |
| 400 | 5 | 4.9 | 4.6 | 4 | 3 |
| 500 | 4.5 | 4.4 | 4.1 | 3.6 | 2.7 |
| 600 | 4.1 | 4 | 3.7 | 3.3 | 2.4 |
| 700 | 3.8 | 3.7 | 3.5 | 3 | 2.3 |
| 800 | 3.5 | 3.5 | 3.2 | 2.8 | 2.1 |
| 900 | 3.3 | 3.3 | 3.1 | 2.7 | 2 |
| 1000 | 3.2 | 3.1 | 2.9 | 2.5 | 1.9 |
| 1100 | 3 | 3 | 2.8 | 2.4 | 1.8 |
| 1200 | 2.9 | 2.8 | 2.6 | 2.3 | 1.7 |
| 1300 | 2.8 | 2.7 | 2.5 | 2.2 | 1.7 |
| 1400 | 2.7 | 2.6 | 2.4 | 2.1 | 1.6 |
| 1500 | 2.6 | 2.5 | 2.4 | 2.1 | 1.5 |
| 1600 | 2.5 | 2.4 | 2.3 | 2 | 1.5 |
| 1700 | 2.4 | 2.4 | 2.2 | 1.9 | 1.5 |
| 1800 | 2.4 | 2.3 | 2.2 | 1.9 | 1.4 |
| 1900 | 2.3 | 2.2 | 2.1 | 1.8 | 1.4 |
| 2000 | 2.2 | 2.2 | 2 | 1.8 | 1.3 |
Note: Cell entries are sample error figures.
(Source of table: Survey Research Methods, by Earl R. Babbie, Wadsworth Publishing Co., 1973, page 376)