What is the formula to find the answer to this problem

Ho: #1 ' #2 = '3 E1 = 35361, E2 = 94o?3 standard error of E1 - E2 = 1153 The approximate 95% CI for #1 #2 is ':| x to ':| The result of the hypothesis test is: O Reject H0, because the null value is inside the 95% Cl. C) Reject H0, because the null value is outside the 95% CI. {'3' Fail to reject HD, because the null value is inside the 95% CI. O Fail to reject HD, because the null value is outside the 95% CI. X