Personally I found number 15 difficult, specifically on one part of the problem where it asks to find the lower and upper critical values. Assume that both populations are normally distributed. a) Test whether u1#2 at the a=0.05 level of significance for the given sample data. b) Construct a 95% confidence interval about u1-12. o Determine the critical value(s). Select the correct choice below and fill in the answer box(es) within your choice. I'm unsure how to solve this, or what function to use in the T184