Refer to the data on sanitation levels of cruise ships, presented in Exercise. These data are saved

Question:

Refer to the data on sanitation levels of cruise ships, presented in Exercise. These data are saved in the SHIPSANIT file.
a. Use the box plot method to detect any outliers in the data.
b. Use the z-score method to detect any outliers in the data.
c. Do the two methods agree? If not, explain why.