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A researcher learned from past studies that if the time standard for inspecting a car is 16.8 minutes, and a group of 24 car samples

A researcher learned from past studies that if the time standard for inspecting a car is 16.8 minutes, and a group of 24 car samples are sent, S^2=12.5 minutes. Under a=0.05, the standard for inspecting a car is verified Is the difference still 16.8 minutes?

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