The mean and the standard deviation of the sample of 100, Ask an Expert

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The mean and the standard deviation of the sample of 100 bank customer waiting times are x = 5.01 and s = 2.116. Calculate a t-based 5 percent confidence interval for mu, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that I1/4 is less than 5 minutes?. (Choose the nearest degree of freedom for the given sample size. Round your answers to 3 decimal places.)

The t-based 95 percent confidence interval is

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