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A research knows that the standard deviation of the time it takes to inspect a car is 16.8 minutes. A random sample of 24 cars

A research knows that the standard deviation of the time it takes to inspect a car is 16.8 minutes. A random sample of 24 cars is selected and inspected. The standard deviation is 12.5 minutes .At=0.05 can it be concluded that the standard deviation has changed Use the p-value method .Assume the variable is normally distributed Hint we are testing the variance (or standard deviation in this case)

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