Statistics are handy when it comes to making predictions, but to make accurate predictions, you need to know how reliable your results are. The following Z- table shows standard scores and percentiles in a standard distribution:
| Standard Score | Percentile | Standard Score | Percentile | Standard Score | Percentile |
|---|---|---|---|---|---|
| –3.4 | 0.03% | –1.1 | 13.57% | +1.2 | 88.49% |
| –3.3 | 0.05% | –1.0 | 15.87% | +1.3 | 90.32% |
| –3.2 | 0.07% | –0.9 | 18.41% | +1.4 | 91.92% |
| –3.1 | 0.10% | –0.8 | 21.19% | +1.5 | 93.32% |
| –3.0 | 0.13% | –0.7 | 24.20% | +1.6 | 94.52% |
| –2.9 | 0.19% | –0.6 | 27.42% | +1.7 | 95.54% |
| –2.8 | 0.26% | –0.5 | 30.85% | +1.8 | 96.41% |
| –2.7 | 0.35% | –0.4 | 34.46% | +1.9 | 97.13% |
| –2.6 | 0.47% | –0.3 | 38.21% | +2.0 | 97.73% |
| –2.5 | 0.62% | –0.2 | 42.07% | +2.1 | 98.21% |
| –2.4 | 0.82% | –0.1 | 46.02% | +2.2 | 98.61% |
| –2.3 | 1.07% | 0.0 | 50.00% | +2.3 | 98.93% |
| –2.2 | 1.39% | +0.1 | 53.98% | +2.4 | 99.18% |
| –2.1 | 1.79% | +0.2 | 57.93% | +2.5 | 99.38% |
| –2.0 | 2.27% | +0.3 | 61.79% | +2.6 | 99.53% |
| –1.9 | 2.87% | +0.4 | 65.54% | +2.7 | 99.65% |
| –1.8 | 3.59% | +0.5 | 69.15% | +2.8 | 99.74% |
| –1.7 | 4.46% | +0.6 | 72.58% | +2.9 | 99.81% |
| –1.6 | 5.48% | +0.7 | 75.80% | +3.0 | 99.87% |
| –1.5 | 6.68% | +0.8 | 78.81% | +3.1 | 99.90% |
| –1.4 | 8.08% | +0.9 | 81.59% | +3.2 | 99.93% |
| –1.3 | 9.68% | +1.0 | 84.13% | +3.3 | 99.95% |
| –1.2 | 11.51% | +1.1 | 86.43% | +3.4 | 99.97% |
