The acceleration times (in seconds) from 0 to 60 miles per hour for 26 randomly selected sedans are shown in the table. 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 and
(b) The population standard deviation σ. Interpret the results.

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Acceleration times (in seconds) 6.9 8.3 7.6 7.2 7.5 7.6 9.3 7.8 9.4 6.4 8.2 7.7 7.8 9.8 6.3 6.4 8.9 6.2 9.0 9.6 8.3 3 9.1 6.2 9.7 7.1 9.4