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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
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Caselet on McDonald’s vs. Burger King - Waiting time
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
Problems on Sampling Variability and Standard Error and Confidence Intervals
Estimate the population mean
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
Find out the probability
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