The acceleration times (in seconds) from 0 to 60 miles per hour for 26 randomly selected...
The acceleration times (in seconds) from 0 to 60 miles per hour for 26 randomly selected sedans had a sample mean of 7.99 seconds and a sample standard deviation of 1.190. Construct a 98% confidence interval for the population standard deviation. Assume the sample is from a normal population. Enter your answer in interval notation. If your left endpoints 5 and your right endpoint is 7, your answer would be (5, 7). Round your endpoints to three decimal places.
Homework Answers
The 98% confidence interval for the population standard deviation
where
s= 1.190
n= 26
For 98% confidence , 
0.99
degrees of freedom = n-1 = 26-1=25
For 98% confidence with df =25
Thus ,98% confidence interval for the population standard deviation
=(0.894 , 1.753 )
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