Explore BrainMass

Confidence interval for mean

6. A route planner for America West Airlines wants to estimate the mean flight time between Phoenix and Philadelphia. A random sample of 49 trips is recorded and the sample mean was 279 minutes with a sample standard deviation of 15 minutes.

a. Find the 90% confidence interval for μ.
b. Find the 98% confidence interval for

Solution Summary

The solution provides step by step method for the calculation of confidence interval . Formula for the calculation and Interpretations of the results are also included.