A rаndоm sаmple оf 16 pаssenger fares оn Amtrak between Chicago and Denver resulted in a mean fare of $180 and a standard deviation of $40. We are interested in estimating the Confidence Interval on the true "Population Mean" fare between Chicago and Denver on Amtrak. Based on the problem description, Which probability distribution should you use in computing the "Margin of Error" in the Confidence Interval Estimation on Population Mean?