Since there are no given sample statistics, Let us use the following: n=35, x=24.1, and o=2.7 2-tail test Using a T-test: t(24.1) = (24.1-23/[2.7/sqrt(35)] = -2.4103 P - value = 2*P(-100< t < -1.9720, when df = 34) = tcdf (-100,-2.4103,34) -> using excel = 0.0107