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A researcher knows from the past that the standard deviation of the time it takes to...

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Statistics

A researcher knows from the past that the standard deviation ofthe time it takes to inspect a car is 16.8 minutes. A random sampleof 24 cars is selected and inspected. The standard deviation is12.5 minutes. At a= 0.05, can it be concluded that the standarddeviation has changed? Use the P-value method. Assume the variableis normally distributed.

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