Conclude that the mean waiting time is less

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Dunkin Donuts claim s that the waiting time of customers for service is normally distributed with a mean of three minutes and a standard deviation of one minute.. The quality assurance department found in a sample of 50 customers that the mean waiting time is 2.85 minutes.. At a 0.05 level of significance,, can we conclude that the mean waiting time is less than three minutes?

Reference no: EM132581613

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