Find ?(?⎯⎯⎯⎯1−?⎯⎯⎯⎯2)σ(x¯1−x¯2). answer:  (b)    Determine the rejection region for the test of ?0:(?1−?2)=3.99H0:(μ1−μ2)=3.99 and ??:(?1−?2)>3.99Ha:(μ1−μ2)>3.99 Use ?=0.03α=0.03. ?>z>  (c)    Compute the test statistic. ?=z=

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