Question: Construct a 90% confidence interval for 2 1/2 2 in Exercise 9.46. on page 295. Should we have assumed 2 1 = 2 2 in

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

in Exercise 9.46. on page 295. Should we have assumed

σ2 1 = σ2 2 in constructing our confidence interval for

μI − μII ?

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