In: Statistics and Probability
3. Let X1...Xn be N(μX,σ) and Y1...Yn be iid N(μy,σ) with the two samples X1...Xn, and Y1...Xn independent of each other. Assume that the common population SD σ is known but the two means are not. Consider testing the hypothesis null: μx = μy vs alternative: μx ≠ μy.
a. Find the likelihood ratio test statistic Λ. Specify which MLEs you are using and how you plug them in.