(Answered) You work as a purchasing manger at walter pharmaceuticals

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You work as a purchasing manger at walter Pharmaceuticals. Yor currnet suppliers of raw materials has an average delivery time of 14 days. Another vendor approaches you and says that they can match your current vendors's price but can beat delivaty times. You Order 16 trial shipments from the new vendor. The test deliveries give a mean delivery time of 12 days with a standard Deviation among the test deliveries of 4.4 days. At a significance level of .05, Does the new vendor provide better delivery time?

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