Question 2 (1 point) Suppose we are interested in calculating a 90% confidence interval for the mean of a normally distributed population. We've drawn a sample of 8 observations from this population, and found a sample mean of 398.1 and a sample standard deviation of 38.0. What is the appropriate lower endpoint of the 90% interval for mu? (e.g. If the interval is (3.712,9.674), give 3.712 as your response.) (Give your response to at least 3 decimal places. Give only your numeric response, and no extra characters or symbols.) Your