Question

2.Suppose the average commute time of your employees is unknown. The standard deviation of their

commute time is estimated as 28.4 minutes.

**How many employees must be included in a sample to a 99 percent confidence interval for the average commute time with a confidence interval width of no more than 20 minutes?**

Note that the correct answer will be evaluated based on the z-values in the summary table in the Teaching Materials section.

Remember to round your answer **up** to an integer.

Note that the correct answer will be evaluated based on the full-precision result you would obtain using Excel

Statistics and Probability