If all goes according to plan, you will walk from the lecture hall to Rick's Bakery in downtown Urbana and get some chocolate cake every day in this semester. Suppose that the file "HW4.Q2.csv" contains data on the amount of time it will take for you to walk this distance for the first nine days lectures.

a. (1 point) Below is a box plot of these nine observations. Please comment on whether or not you think these data follow a normal distribution:

b. (1 point) Without the aid of software, please perform a Sign test to determine whether or not the population median time it takes to walk exceeds 25 minutes. Please use ? = 0.05.

c. (1 point) Please construct a 95% CI on the median amount of time required to walk.