| ERS | CRS | Row total |
---|
Win | 417 | 225 | 642 |
Loss | 83 | 275 | 358 |
Col total | 500 | 500 | 1000 |
- The p-value appearing there was calculated by the formula \(\sum _{i=417}^{500} {642 \choose i} {358 \choose 500-i} / {1000 \choose 500} \approx 4.48E-38 \). Note that the values of the hypergeometric distribution inside the sum are the probabilities of choosing 500 experiments out of 1000, containing exactly i ERS wins of the given 642 total number of wins and also choosing exactly 500−i ERS losses of the given 358 total number of losses