In addition to its core business of bagels and coffees, Dunkin' Donuts also sells hot chocolate for non-coffee crowd. Customer search shows that the ideal temperature for hot chocolate is 142 ("hot but not too hot"). A random sample of 24 cups of hot chocolates is taken in various times, and the temperature of each cup is measured using an ordinary kitchen thermometer that is accurate to the nearest whole degree. At =. does this sample evidence show that the true mean differs from 142?

temp 140 140 141 145 143 144 142 140 145 143 140 140 141 141 137 142 143 141 142 142 143 141 138 139