Question: I have hit the wall on a simple problem. I seem to be hitting these more often now.

At any rate. 8.1.11, the difference between two means hypothesis test standardized test statistic requires µ_{1} – µ_{2}. So, how does one calculate this when we are never given a value for μ? I used 0 for the values, and came out with the WRONG answer. Request a nudge in the right direction.

Answer: James, for most of our mean difference problems, we will not be given the assumed population means or the mean difference. If not, you use 0 for the mean difference. In your problem, you are told that μ_{1} = μ_{2}, so the mean difference μ_{1} – μ_{2}, is 0.

Here is the StatCrunch solution with slightly different summary data: