"I have my null hypothesis as mean eastern sales = mean western sales but just want to check which excel output to use. I know it is two-tailed and I think I can use p or t but just want to check. I have the following output: t-stat =-0.8, P(T less than/equal to t) two-tail = 0.4266 and t Critical two-tail = 2.002? It is for a significance level of 0.05"