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A physician wanted to estimate the mean length of time that a patient had to wait to see him after arriving at the office. A

A physician wanted to estimate the mean length of time that a patient had to wait to see him after arriving at the office. A random sample of 50 patients showed a mean waiting time of 30 minutes and a standard deviation of 9 minutes. You decide to construct a 95% CI of the mean waiting time. Which critical value will you use? t distribution and z distribution

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