Calculate the margin of error E= z a/2*%u03BC/%u221An if the necessary requirements are satisfied. The confidence level is 99%, the sample size is n=78, and the mean =19. Please show me the steps invovled to solve. My text and tutorial viedos are hard to understand. Appreciate any help! Solution 1) E = 2.575*19/sqrt 78 = 5.5.