Question: 9.79 Construct a 90% confidence interval for 2 1 /2 2 in Exercise 9.46 on page 315. Should we have assumed 2 1 = 2

9.79 Construct a 90% confidence interval for σ2 1 /σ2 2

in Exercise 9.46 on page 315. Should we have assumed

σ2 1 = σ2 2 in constructing our confidence interval for

μI − μI I ?

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