A study was conducted to estimate u, the mean commute distance that all employed U.S. adults travel to work. Suppose a random sample of 49 employed U.S. adults gives a mean commute distance of 22 miles and that from prior studies, the population standard deviation is assumed to be O = 8.4 miles. We are 95% confident that the mean commute distance to work of all employed U.S. adults falls between which of the following intervals? O 18.4 to 25.6 19.6 to 24.4 O 20.8 to 23.2 5.2 to 38.8