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

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