A magazine includes a report of the prices of subcompact digital

  

Assume the sample is taken from a normally distributed population and construct the indicated confidence intervals for (a) the population variance and (b) the population standard deviation. Interpret the results:
 

A magazine includes a report of the prices of subcompact digital cameras. The article states that 11 randomly selected subcompact digital cameras have a sample standard deviation of $109. Use an 80% level of confidence.

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