The acceleration times (in seconds) from 0 to 60 miles per hour for 33 randomly selected sedans

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The acceleration times (in seconds) from 0 to 60 miles per hour for 33 randomly selected sedans are listed. Use a 98% level of confidence.


6.6 6.3 5.1 5.3 5.4 9.5 7.5 5.0 5.2 3.3 6.5 4.5 6.7 7.9 8.8 7.1 7.9 5.8 8.6 6.9 8.1 6.0 18.4 9.1 6.8 12.5 4.2 71 9.9 9.5


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 s. Interpret the results.

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