
ERS

CRS

Row total


Win

417

225

642

Loss

83

275

358

Col total

500

500

1000

 The pvalue appearing there was calculated by the formula \(\sum _{i=417}^{500} {642 \choose i} {358 \choose 500i} / {1000 \choose 500} \approx 4.48E38 \). 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