Given that the 84% confidence interval for the waiting time (in minutes) of emergency room patients is (38.5, 145.8), answer the following: a.) Is this confidence interval for a proportion or a mean? O proportion O mean b.) What does a confidence level of 84% represent with respect to the distribution curve? O the area in the tail regions is 0.84 O the area in the middle region is 0.84 O the critical value is 0.84

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