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A researcher is interested in estimating the average commute time of people in a city. Assume that the commute time follows a normal distribution with

A researcher is interested in estimating the average commute time of people in a city. Assume that the commute time follows a normal distribution with a standard deviation of 9.4 minutes. The researcher takes a sample of 10 people and obtains the average commute time of 26.3 minutes. Estimate a 99% confidence interval for the population mean. What is the error term?

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