XÌ 1 and S 2 1 are the sample mean and sample variance from a population with
Question:
(a) Show that X1 X2 is an unbiased estimator of μ1 μ2.
(b) Find the standard error of XÌ 1 XÌ 2. How could you estimate the standard error?
(c) Suppose that both populations have the same variance; that is, Ï21 = Ï22 = Ï2. Show that
is an unbiased estimator of Ï2.
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Related Book For
Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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