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.
1 answer