A random sample of 16 passenger fares on Amtrak between Chic…

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. What is the numerical value of Margin of Error (rounded as shown) computed for estimating 94% Confidence Interval estimate on the "Population Mean" fares between Chicago and Denver on Amtrak?