Since an instant replay system for tennis was introduced at a major tournament, men challenged 1417 referee calls, with the result that 422 of the calls were overturned. Women challenged 774 referee calls, and 218 of the calls were overturned. Use a 0.05 significance level to test the claim that men and women have equal success in challenging calls. Identify the test statistic, z= ?
Round to two decimal places as needed.