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 an

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 55.4 lb. using this sample data construct a 90% confidence interval for the standard deviation.