Incorrect Your answer is Incorrect. . (a): Your answer is Incorrect. . (b): Your answer is Incorrect. We want to conduct a hypothesis test of the claim that the population mean daily profit of a convenience store is less than 485 dollars, So, we record the daily profit for a random sample of days. The sample has a mean of 492 dollars and a standard deviation of 78 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 answers to two decimal places. (a) The sample has size 12, and it is from a normally distributed population with a known standard deviation of 75. 1= .345 It is unclear which test statistic to use. X (b) The sample has size 15, and it is from a normally distributed population with an unknown standard deviation. It is unclear which test statistic to use