We want to conduct a hypothesis test of the claim that the population mean daily profit of a convenience store is more than 480 dollars. So, we record the daily profit for a random sample of days. The sample has a mean of 489 dollars and a standard deviation of 80 dollars. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answer to 2 decimal places.

b). The sample has size 12, and is from a normally distributed population with a known standard deviation of 75.

z=

t=

It is unclear which test statistic to use