Table 32: 95% confidence limits for estimates, based on SHS sub-samples sizes
Sub-sample size (n=100%) | Estimate |
|---|
5% | 10% | 15% | 20% | 25% | 30% | 35% | 40% | 45% | 50% |
|---|
or | or | or | or | or | or | or | or | or |
|---|
95% | 90% | 85% | 80% | 75% | 70% | 65% | 60% | 55% |
|---|
percentage points ( + / - ) |
|---|
100 | 5.1 | 7.1 | 8.4 | 9.4 | 10.2 | 10.8 | 11.2 | 11.5 | 11.7 | 11.8 |
|---|
200 | 3.6 | 5 | 5.9 | 6.7 | 7.2 | 7.6 | 7.9 | 8.1 | 8.3 | 8.3 |
|---|
300 | 3 | 4.1 | 4.8 | 5.4 | 5.9 | 6.2 | 6.5 | 6.7 | 6.8 | 6.8 |
|---|
400 | 2.6 | 3.5 | 4.2 | 4.7 | 5.1 | 5.4 | 5.6 | 5.8 | 5.9 | 5.9 |
|---|
500 | 2.3 | 3.2 | 3.8 | 4.2 | 4.6 | 4.8 | 5 | 5.2 | 5.2 | 5.3 |
|---|
600 | 2.1 | 2.9 | 3.4 | 3.8 | 4.2 | 4.4 | 4.6 | 4.7 | 4.8 | 4.8 |
|---|
700 | 1.9 | 2.7 | 3.2 | 3.6 | 3.8 | 4.1 | 4.2 | 4.4 | 4.4 | 4.4 |
|---|
800 | 1.8 | 2.5 | 3 | 3.3 | 3.6 | 3.8 | 4 | 4.1 | 4.1 | 4.2 |
|---|
900 | 1.7 | 2.4 | 2.8 | 3.1 | 3.4 | 3.6 | 3.7 | 3.8 | 3.9 | 3.9 |
|---|
1,000 | 1.6 | 2.2 | 2.7 | 3 | 3.2 | 3.4 | 3.5 | 3.6 | 3.7 | 3.7 |
|---|
1,200 | 1.5 | 2 | 2.4 | 2.7 | 2.9 | 3.1 | 3.2 | 3.3 | 3.4 | 3.4 |
|---|
1,400 | 1.4 | 1.9 | 2.2 | 2.5 | 2.7 | 2.9 | 3 | 3.1 | 3.1 | 3.1 |
|---|
1,600 | 1.3 | 1.8 | 2.1 | 2.4 | 2.5 | 2.7 | 2.8 | 2.9 | 2.9 | 2.9 |
|---|
1,800 | 1.2 | 1.7 | 2 | 2.2 | 2.4 | 2.5 | 2.6 | 2.7 | 2.8 | 2.8 |
|---|
2,000 | 1.1 | 1.6 | 1.9 | 2.1 | 2.3 | 2.4 | 2.5 | 2.6 | 2.6 | 2.6 |
|---|
2,500 | 1 | 1.4 | 1.7 | 1.9 | 2 | 2.2 | 2.2 | 2.3 | 2.3 | 2.4 |
|---|
3,000 | 0.9 | 1.3 | 1.5 | 1.7 | 1.9 | 2 | 2 | 2.1 | 2.1 | 2.1 |
|---|
3,500 | 0.9 | 1.2 | 1.4 | 1.6 | 1.7 | 1.8 | 1.9 | 1.9 | 2 | 2 |
|---|
4,000 | 0.8 | 1.1 | 1.3 | 1.5 | 1.6 | 1.7 | 1.8 | 1.8 | 1.9 | 1.9 |
|---|
5,000 | 0.7 | 1 | 1.2 | 1.3 | 1.4 | 1.5 | 1.6 | 1.6 | 1.7 | 1.7 |
|---|
6,000 | 0.7 | 0.9 | 1.1 | 1.2 | 1.3 | 1.4 | 1.4 | 1.5 | 1.5 | 1.5 |
|---|
7,000 | 0.6 | 0.8 | 1 | 1.1 | 1.2 | 1.3 | 1.3 | 1.4 | 1.4 | 1.4 |
|---|
8,000 | 0.6 | 0.8 | 0.9 | 1.1 | 1.1 | 1.2 | 1.3 | 1.3 | 1.3 | 1.3 |
|---|
9,000 | 0.5 | 0.7 | 0.9 | 1 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 | 1.2 |
|---|
10,000 | 0.5 | 0.7 | 0.8 | 0.9 | 1 | 1.1 | 1.1 | 1.2 | 1.2 | 1.2 |
|---|
12,000 | 0.5 | 0.6 | 0.8 | 0.9 | 0.9 | 1 | 1 | 1.1 | 1.1 | 1.1 |
|---|
14,000 | 0.4 | 0.6 | 0.7 | 0.8 | 0.9 | 0.9 | 0.9 | 1 | 1 | 1 |
|---|
16,000 | 0.4 | 0.6 | 0.7 | 0.7 | 0.8 | 0.9 | 0.9 | 0.9 | 0.9 | 0.9 |
|---|
18,000 | 0.4 | 0.5 | 0.6 | 0.7 | 0.8 | 0.8 | 0.8 | 0.9 | 0.9 | 0.9 |
|---|
20,000 | 0.4 | 0.5 | 0.6 | 0.7 | 0.7 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
|---|
25,000 | 0.3 | 0.4 | 0.5 | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 | 0.7 | 0.7 |
|---|
30,000 | 0.3 | 0.4 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.7 | 0.7 | 0.7 |
|---|
35,000 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 |
|---|
40,000 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.6 |
|---|
45,000 | 0.2 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.6 | 0.6 |
|---|
50,000 | 0.2 | 0.3 | 0.4 | 0.4 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 |
|---|
e.g. an estimate of 55% that is based on a sample of 800 has 95% confidence limits of 55% +/- 4.1 points