Solved: Waiting time of customers for service normally distributed, Basic Statistics

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Waiting time of customers for service normally distributed

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Q: The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?

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Basic Statistics: Waiting time of customers for service normally distributed

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