Posted by **Jason L** on Monday, February 26, 2007 at 3:50pm.

It is known that the amount of time needed to change the oil in a car is normally distributed. A random sample of 100 oil changes yielded a sample mean of 22 minutes and a standard deviation of 5 minutes. Then compared to the interval estimate for the previous question. This 99% confidence interval estimate of the mean of the population would be -

identical

much more precise

a bit more precise

a bit less precise

much less precise

Check your data from the previous question to help you answer this one.

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