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Testing of Mean

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The Mac Burger 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 Mac Burger 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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Solution Summary

To test if the mean waiting time of customer is significant.

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Ho: mean = 3 minutes
H1: mean < 3 minutes

Level of significance =5%

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