A pizza restaurant manager claims that average home delivery time for their pizza is no more than 20 minutes. A random sample of 49 home delivery pizzas was gathered. The sample mean was found to be 21.25 minutes and standard deviation was found to be 4.3 minutes. Is there evidence to reject manager's claim at alpha =.01? Carry out an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.