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    At the .05 level of significance, can we conclude that the mean waiting time is less than 3 minutes?

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    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 level of significance, can we conclude that the mean waiting time is less than 3 minutes?

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    Solution Summary

    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 level of significance, can we conclude that the mean waiting time is less than 3 minutes?

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