A pizza shop owner claims that the average time it takes for his drivers to deliver a pizza order is 30 minutes or less. You believe otherwise and decide to test this claim and record a random sample of 14 pizza orders, with the following delivery times (in minutes).

31 39 34 31 39 29 31

15 27 23 48 41 29 45

Assuming that the times are normally distributed with a known population standard deviation of 6, can we conclude that that the average time it takes for his drivers to deliver a pizza order is more than 30 minutes? Use a 5% level of significance