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 for all their new automobiles is
A) 16.05 to 45.72
B) 4.78 to 8.07
C) 2.93 to 6.31
D) 22.83 to 65.06
Correct Answer:
Verified
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