The reserve capacities (in hours) of 18 randomly selected automotive batteries are listed. Use a 99% level

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The reserve capacities (in hours) of 18 randomly selected automotive batteries are listed. Use a 99% 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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