Is there evidence to reject the claim at the given alpha

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Reference no: EM13135761

An 18-minute Oil and Lube service claims that their average service time is no more than 18 minutes. A random sample of 40 service times was collected, and the sample mean was found to be 20.5 minutes, with a sample standard deviation of 3.8 minutes. Is there evidence to reject the claim at the alpha = 0.01 level? Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.

Reference no: EM13135761

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