In an unpaired two-sample problem, an experimenter
Chapter 9, Problem 9.3.9(choose chapter or problem)
In an unpaired two-sample problem, an experimenter observes n =47, x =100.85 from population A and m =62, y =89.32 from population B. Suppose that the experimenter wishes to use values A =25 and B =20 for the population standard deviations. (a) What is the exact p-value for the hypothesis testing problem H0 : A = B +3.0 versus HA : A = B +3.0? (b) Construct a 90% two-sided condence interval for A B.
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