Question: The average annual precipitations (in inches) of a random sample of 30 years in San Francisco, California, have a sample standard deviation of 8.18 inches.

The average annual precipitations (in inches) of a random sample of 30 years in San Francisco, California, have a sample standard deviation of 8.18 inches. Use a 98% level of confidence.
Assume the sample is from a normally distributed population and construct the indicated confidence intervals for
(a) The population variance σ2
(b) The population standard deviation σ. Interpret the results.

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