One teacher at a school wants to estimate the average amount of time students take to get from one class to the next. Taking a random sample of 210 students, he finds that the sample average for this travel time is 4.6 minutes. (a) If it can be presumed from experience that σ = 1:40 minutes, find a 98% confidence interval for the population mean µ. (b) What is the margin of error for this 98% confidence interval?

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