Independent random samples of size


Two independent random samples of size n1 = 24 and n2 = 20 are taken from the two normal populations. The sample means are x1-bar = 220 and x2-bar = 240. The variances are sigma1^2 = 15 and sigma2^2 = 18. Find the following:

a) a 90% two sided confidence interval on Mu2 - Mu1.

b) a 99% upper confidence interval on Mu2 - Mu 1.

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Basic Statistics: Independent random samples of size
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