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The quality control manager of a car antifreeze manufacturer wants to find the fluctuations in the amount of antifreeze solution that a container can hold.

The quality control manager of a car antifreeze manufacturer wants to find the fluctuations in the amount of antifreeze solution that a container can hold. She selects a sample of 18 such container and arrives at an average of 3787 lb., and a s. d. of 65.4lb. Using this sample data construct a 90% confidence interval for thestandarddeviationof the car antifreeze.

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