original research question ? a.two-sample t interval for μ1−μ2μ1−μ2 b.one-sample z test for a proportion. c.two-sample z test for p1−p2p1−p2 d.two-sample z interval for p1−p2p1−p2 e.two-sample t test for μ1−μ2μ1−μ2

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