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A car dealer claims that the average wait time for an oil change is less than 30 minutes. The population of wait times is normally

A car dealer claims that the average wait time for an oil change is less than 30 minutes. The population of wait times is normally distributed and 26 customers are sampled. The sample mean is 28.7 minutes and the standard deviation of the sample is 2.5 minutes. Test the claim at the .05 significance level (=.05) using the traditional method

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