Solve the problem. For large numbers of degrees of freedom, the critical x values can be approximated using the formula x (z+ 2k-1), where k is the number of degrees of = 2 freedom and z is the critical value. To find the lower critical value, the negative z-value is used, to find the upper critical value, the positive z-value is used. Use this approximation to estimate the critical value of x2 in a two-tailed hypothesis test with n = 104 and a = 0.10. OA. 280.300 and x 127.406 OB. 285.903 and x 122.735 OC. 281.186 and x 128.520 OD. 284.992 and x = 21.646