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A random sample of 21 nickels in circulation were measured with a very accurate micrometer to...

A random sample of 21 nickels in circulation were measured with a very accurate micrometer to find a mean of 0.834343 inch and a standard deviation of 0.001886 inch.

What is a 99% confidence interval for the standard deviation (correct to 4 decimal places) of all circulating nickels?

Show work please and thank you.

Math   Statistics-And-Probability   
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