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A major retailer promises 2 day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a

A major retailer promises 2 day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a significance level of 0.05, and checks a randomly chosen sample of 400 orders. The results of the sample are given below. Shipping times 2.05602454 100 0.48326032 Shipping Times Mean Variance Observations Hypothesized Mean df t Stat P(T

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