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A major retailer promises day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a significance level
A major retailer promises day shipping for certain online orders. A consumer advocacy group believes that the shipping times are longer at a significance level of , and checks a randomly chosen sample of orders. The results of the sample are given below.Does the data meet the following conditions for the -distribution?The population parameter is the mean shipping time for the 400 orders The sample statistic is the mean shipping time for all shipments Randomness:Normality: Pick Yes, because the histogram appears to be approximately normal
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