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Margin Of Error Reference Chart
The tabulated value is the margin of error (at 95% confidence level) for a given
sample size & rating.
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Sample Size (n) |
Rating
(%) |
10 |
40 |
75 |
100 |
150 |
200 |
250 |
300 |
350 |
400 |
450 |
500 |
600 |
700 |
800 |
900 |
1000 |
|
0.1% |
1.96% |
0.98% |
0.72% |
0.62% |
0.51% |
0.44% |
0.39% |
0.36% |
0.33% |
0.31% |
0.29% |
0.28% |
0.25% |
0.23% |
0.22% |
0.21% |
0.20% |
|
0.5% |
4.37% |
2.19% |
1.60% |
1.38% |
1.13% |
0.98% |
0.87% |
0.80% |
0.74% |
0.69% |
0.65% |
0.62% |
0.56% |
0.52% |
0.49% |
0.46% |
0.44% |
|
1.0% |
6.17% |
3.08% |
2.25% |
1.95% |
1.59% |
1.38% |
1.23% |
1.13% |
1.04% |
0.98% |
0.92% |
0.87% |
0.80% |
0.74% |
0.69% |
0.65% |
0.62% |
|
2.0% |
8.68% |
4.34% |
3.17% |
2.74% |
2.24% |
1.94% |
1.74% |
1.58% |
1.47% |
1.37% |
1.29% |
1.23% |
1.12% |
1.04% |
0.97% |
0.91% |
0.87% |
|
3.0% |
10.57% |
5.29% |
3.86% |
3.34% |
2.73% |
2.36% |
2.11% |
1.93% |
1.79% |
1.67% |
1.58% |
1.50% |
1.36% |
1.26% |
1.18% |
1.11% |
1.06% |
|
4.0% |
12.15% |
6.07% |
4.43% |
3.84% |
3.14% |
2.72% |
2.43% |
2.22% |
2.05% |
1.92% |
1.81% |
1.72% |
1.57% |
1.45% |
1.36% |
1.28% |
1.21% |
|
5.0% |
13.51% |
6.75% |
4.93% |
4.27% |
3.49% |
3.02% |
2.70% |
2.47% |
2.28% |
2.14% |
2.01% |
1.91% |
1.74% |
1.61% |
1.51% |
1,42% |
1.35% |
|
6.0% |
14.72% |
7.36% |
5.37% |
4.65% |
3.80% |
3.29% |
2,94% |
2.69% |
2.49% |
2.33% |
2.19% |
2.08% |
1.90% |
1.76% |
1.65% |
1.55% |
1.47% |
|
7.0% |
15.81% |
7.91% |
5.77% |
5.00% |
4.08% |
3.54% |
3.16% |
2.89% |
2.67% |
2.50% |
2.36% |
2.24% |
2.04% |
1.89% |
1.77% |
1.67% |
1.58% |
|
8.0% |
16.81% |
8.41% |
6.14% |
5.32% |
4.34% |
3.76% |
3.36% |
3.07% |
2.84% |
2.66% |
2.51% |
2.38% |
2.17% |
2.01% |
1.88% |
1.77% |
1.68% |
|
9.0% |
17.74% |
8/87% |
6.48% |
5.61% |
4.58% |
3.97% |
3.55% |
3.24% |
3.00% |
2.80% |
2.64% |
2.51% |
2.29% |
2.12% |
1.98% |
1.87% |
1.77% |
|
10.0% |
18.59% |
9.30% |
6.79% |
5.88% |
4.80% |
4.16% |
3.72% |
3.39% |
3.14% |
2.94% |
2.77% |
2.63% |
2.40% |
2.22% |
2.08% |
1.96% |
1.86% |
|
15.0% |
22.13% |
11.07% |
8.08% |
7.00% |
5.71% |
4.95% |
4.43% |
4.04% |
3.74% |
3.50% |
3.30% |
3.13% |
2.26% |
2.65% |
2.47% |
2.33% |
2.12% |
|
20.0% |
24.79% |
12.40% |
9.05% |
7.84% |
6.40% |
5.54% |
4.96% |
4.53% |
4.19% |
3.92% |
3.70% |
3.51% |
3.20% |
2.96% |
2.77% |
2.61% |
2.48% |
|
25.0% |
26.84% |
13.42% |
9.80% |
8.49% |
6.93% |
6.00% |
5.37% |
4.90% |
4.54% |
4.24% |
4.00% |
3.80% |
3.46% |
3.21% |
3.00% |
2.83% |
2.68% |
|
30.0% |
28.40% |
14.20% |
10.37% |
8.98% |
7.33% |
6.35% |
5.68% |
5,19% |
4.80% |
4.49% |
4.23% |
4.02% |
3.67% |
3.39% |
3.18% |
2.99% |
2.84% |
|
35.0% |
29.56% |
14.78% |
10.79% |
9.35% |
7.63% |
6.61% |
5.91% |
5.40% |
5.00% |
4.67% |
4.41% |
4.18% |
3.82% |
3.56% |
3.31% |
3.12% |
2.96% |
|
40.0% |
30.36% |
15.18% |
11.09% |
9.60% |
7.84% |
6.79% |
6.07% |
5.54% |
5.13% |
4.80% |
4.53% |
4.29% |
3.92% |
3.63% |
3.39% |
3.20% |
3.04% |
|
45.0% |
30.83% |
15.42% |
11.26% |
9.75% |
6.89% |
6.89% |
6.17% |
5.63% |
5.21% |
4.88% |
4.60% |
4.36% |
3.98% |
3.69% |
3.45% |
3.25% |
3.08% |
|
50.0% |
30.99% |
15.50% |
11.32% |
9.80% |
8.00% |
6.93% |
6.20% |
5.66% |
5.24% |
4.90% |
4.62% |
4.38% |
4.00% |
3.70% |
3.46% |
3.27% |
3.10% |
Interpretation:
For a base sample of 75 people, and a rating of 6%, the margin of error is 5.37%.
So, the upper limit is 11.37% and the lower limit is 0.63%
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