Jessica takes a random sample of 25 telecommunications users and constructs a condence interval for die mean postpaid fees for the prior year. Holding all else constant, if she increased due sample size to 30 users, how are re standard error of the mean and the width of the condence interval affected? Standard error of the mean Width of condence interval Increases Becomes wider Increases Becomes narrower Decreases Becomes wider .5553\"? Decreases Becomes narrower