Nielsen Television Audience Measurement

Margin Of Error Reference Chart

The tabulated value is the margin of error (at 95% confidence level) for a given sample size & rating.

  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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