A pizza restaurant manager claims that the average home delivery time for pizza is no more than 18 minutes ...

A pizza restaurant manager claims that the average home delivery time for pizza is no more than 18 minutes. A random sample of 36 home delivery pizza was collected. The sample mean was found to be 19.25 minutes and the standard deviation was found to be 3.3 minutes. Is there evidence to reject the managers claim at alpha= .02? perform an appropriate hypothesis test, showing the necessary calculations and or explain the process used to obtain results.