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Home Q & A Board Science-Related Homework Help Mathematics
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littlej_dvine littlej_dvine
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6 years ago
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.
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KojicoKojico
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6 years ago
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littlej_dvine Author
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6 years ago
Thanks
noodlelicker
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Yesterday
I appreciate what you did here, answered it right Smiling Face with Open Mouth
kater28
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2 hours ago
Helped a lot
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