# Confidence interval.

• Jul 6th 2011, 02:07 PM
SLJSWW
Confidence interval.
A bus company official wanted to estimate the mean time for the trip between two cities.A random sample of such trips gave a mean of 152 minutes and a standard deviation of 12 minutes.Construct a 98% confidence interval for the population mean time.

show me the solution how to do this question...thx(Nod)
• Jul 6th 2011, 02:36 PM
pickslides
Re: Probability
hi there, do you how many samples were taken?

This is kind of important for constructing a conficence interval.
• Jul 6th 2011, 03:38 PM
mr fantastic
Re: Confidence interval.
Quote:

Originally Posted by SLJSWW
A bus company official wanted to estimate the mean time for the trip between two cities.A random sample of such trips gave a mean of 152 minutes and a standard deviation of 12 minutes.Construct a 98% confidence interval for the population mean time.

show me the solution how to do this question...thx(Nod)

Your class notes and/or textbook will certainly explain what you have to do and have clear examples on how to do it. Have you read them? Where are you stuck?