Question: 9.78 Construct a 90% confidence interval for 2 1 /2 2 in Exercise 9.43 on page 315. Were we justified in assuming that 2 1

9.78 Construct a 90% confidence interval for σ2 1 /σ2 2 in Exercise 9.43 on page 315. Were we justified in assuming that σ2 1 = σ2 2 when we constructed the confidence interval for μ1 − μ2 ?

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