please answer the following :)

2. (5 points) A random sample of 16 subjects is drawn from a normal population with a population standard deviation of 3. The sample mean is calculated to be 10. State HOW you would test whether the sample mean differs from the population mean of 9 at a level of significance of a = .05. You do NOT have to calculate a statistic or state results, just EXPLAIN why you chose the test you did and how you would test the resulting statistic (e.g., what statistic you would calculate and how you would use it)