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Exercise 10.108: Suppose that X 1 , X 2 , ..., X n 1 , Y 1 , Y 2 , ..., Y n 2

Exercise 10.108:Suppose that X1, X2, ..., Xn1, Y1, Y2, ..., Yn2 and W1, W2, ..., Wn3 are independent random samples from normal distributions with respective unknown means 1, 2 and 3 and variances 12, 22 and 32.

1. Find the likelihood ratio test for H0: 12 = 22 = 32 against the alternative of at least one inequality.

2. Find an approximate critical region for the test in part (a) if n1, n2 and n3 are large and = 0.05.

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