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Suppose that the waiting times for patients at a local Restaurant are normally distributed with known population standard deviation of 30 minutes. A random sample

Suppose that the waiting times for patients at a local Restaurant are normally distributed with known population standard deviation of 30 minutes. A random sample of 75 patients in the local Restaurant had a mean time of 90 minutes. Assume a 95% confidence interval for the population mean . Keep 2 decimal places in your calculations.

a. what is the correct value of the standard error of the 95% confidence interval.

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