# Question: A confidence interval for a standard deviation for large samples

A confidence interval for a standard deviation for large samples taken from a normally distributed population can be approximated by

Find the 95% confidence interval for the population standard deviation of calculator batteries. A sample of 200 calculator batteries has a standard deviation of 18 months.

Find the 95% confidence interval for the population standard deviation of calculator batteries. A sample of 200 calculator batteries has a standard deviation of 18 months.

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