Question: A locksmith is in the process of selecting a new key-cutting machine. If there is a difference in key-cutting speed between the two machines under

A locksmith is in the process of selecting a new key-cutting machine. If there is a difference in key-cutting speed between the two machines under consideration, he will purchase the faster one. If there is no difference, he will purchase the cheaper machine. The times (in seconds) required to cut each of the 35 most common types of keys were recorded. What should he do?

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