Question: 45. If X1, . . . , Xn is a sample from a normal population having known mean 1 and unknown variance 2 1 ,

45. If X1, . . . , Xn is a sample from a normal population having known mean

μ1 and unknown variance σ2 1 , and Y1, . . . , Ym is an independent sample from a normal population having known mean μ2 and unknown variance

σ2 2 , determine a 100(1− α) percent confidence interval for σ2 1 /σ 2 2 .

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