Note de lecture : pour un échantillon de 900 personnes, si le score mesuré est de 25 %, il y a 95 % de chances que la valeur réelle se situe aujourd’hui entre 22,1 % et 27,9 % (plus ou moins 2,9 points).
| Taille d'échantillon | 2% ou 98% | 5% ou 95% | 10% ou 90% | 15% ou 85% | 20% ou 80% | 25% ou 75% | 30% ou 70% | 35% ou 65% | 40% ou 60% | 45% ou 55% | 50,00% |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 400 cas | 1,401.4 | 2,22.2 | 33 | 3,63.6 | 44 | 4,34.3 | 4,604.6 | 4,804.8 | 4,94.9 | 55 | 55 |
| 500 cas | 1,31.3 | 22 | 2,72.7 | 3,23.2 | 3,63.6 | 3,903.9 | 4,104.1 | 4,34.3 | 4,44.4 | 4,54.5 | 4,54.5 |
| 600 cas | 1,11.1 | 1,81.8 | 2,402.4 | 33 | 3,303.3 | 3,53.5 | 3,803.8 | 3,903.9 | 44 | 4,104.1 | 4,104.1 |
| 700 cas | 11 | 1,701.7 | 2,302.3 | 2,72.7 | 33 | 3,303.3 | 3,53.5 | 3,73.7 | 3,73.7 | 3,803.8 | 3,803.8 |
| 800 cas | 11 | 1,51.5 | 2,12.1 | 2,52.5 | 2,802.8 | 33 | 3,23.2 | 3,403.4 | 3,403.4 | 3,53.5 | 3,53.5 |
| 900 cas | 0,90.9 | 1,51.5 | 22 | 2,402.4 | 2,72.7 | 2,902.9 | 33 | 3,23.2 | 3,23.2 | 3,303.3 | 3,303.3 |
| 1000 cas | 0,80.8 | 1,401.4 | 1,81.8 | 2,302.3 | 2,52.5 | 2,72.7 | 2,902.9 | 33 | 33 | 3,13.1 | 3,13.1 |
| 1100 cas | 0,80.8 | 1,31.3 | 1,81.8 | 2,22.2 | 2,402.4 | 2,62.6 | 2,802.8 | 2,902.9 | 2,902.9 | 33 | 33 |
| 1200 cas | 0,80.8 | 1,31.3 | 1,701.7 | 2,12.1 | 2,302.3 | 2,52.5 | 2,72.7 | 2,802.8 | 2,902.9 | 2,902.9 | 2,902.9 |
| 1300 cas | 0,80.8 | 1,201.2 | 1,701.7 | 22 | 2,22.2 | 2,402.4 | 2,52.5 | 2,72.7 | 2,72.7 | 2,802.8 | 2,802.8 |
| 1400 cas | 0,80.8 | 1,201.2 | 1,701.7 | 22 | 2,22.2 | 2,402.4 | 2,52.5 | 2,72.7 | 2,72.7 | 2,802.8 | 2,802.8 |
| 1500 cas | 0,700.7 | 1,201.2 | 1,51.5 | 1,901.9 | 2,12.1 | 2,302.3 | 2,402.4 | 2,52.5 | 2,62.6 | 2,62.6 | 2,62.6 |
| 1800 cas | 0,600.6 | 1,11.1 | 1,401.4 | 1,701.7 | 1,901.9 | 22 | 2,22.2 | 2,302.3 | 2,302.3 | 2,402.4 | 2,402.4 |
