5. To illustrate Exercise 4.2.24, let X1, X2,..., X9 and Y1, Y2,..., Y12 rep- resent two independent random samples from the respective normal distributions N(u1,07) and N(42, 03). It is given that of = 303, but o is unknown. Define a random variable that has a t-distribution that can be used to find a 95% confidence interval for µi – #2.

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