The manager of the service department of a local car dealership has noted that the service times of a sample of 30 new automobiles has a standard deviation of 6 minutes. A 95% confidence interval estimate for the standard deviation of the service times (in minutes) for all their new automobiles is
a. 16.047 to 45.722.
b. 4.778 to 8.066.
c. 2.93 to 6.31.
d. 22.833 to 65.059.
b
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