1. The problem statement, all variables and given/known data http://prntscr.com/8ea2rk 2. Relevant equations In statistics, when testing hypothesis for both sides (left and right), is it possible that Xaverage - MUo = 0 (upper part of the equation I provided)? If so how to solve this kind of task? 3. The attempt at a solution If I get Xaverage = 0.1 (exactly) and MUo = 0.1 then test result is equal to 0. How to proceed with this? What is the conclusion? Do we accept Zero Hypothesis or do we reject it?