Construct a 90 confidence interval for 2 1 2 11 in Exercise 9 46 should we have assumed 2 1 2 11 in constructing our confidence interval for 2 1 11

Question: Construct a 90% confidence interval for 2 1 / 2 11 in Exercise 9.46 should we have assumed 2 1 =

Construct a 90% confidence interval for σ²₁/ σ²₁₁in Exercise 9.46 should we have assumed σ²₁ = σ²₁₁ in constructing our confidence interval for μ²₁ – μ₁₁?

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