The numbers of touchdowns scored by 11 randomly selected NCAA Division I Subdivision teams in a recent

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The numbers of touchdowns scored by 11 randomly selected NCAA Division I Subdivision teams in a recent season have a sample standard deviation of 9.35. Use an 80% level of confidence.


Assume the sample is from a normally distributed population and construct the indicated confidence intervals for 

(a) The population variance σ2 and 

(b) the population standard deviation σ. Interpret the results.

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