Mathematics, 21.11.2019 02:31 Wildstyle3000

4) we want a 99% confidence interval for the average amount of time (in minutes) spent commuting to work in a large city. the interval is to have a margin of error of no more than 3 minutes, and the amount of time spent commuting has a normal distribution with a standard deviation  = 18 minutes. what numbers of observations are required?

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