Censored Data Data Set 12 in Appendix: Data Sets lists the numbers of years that U.S. presidents lived after their first inauguration. As of writing, five of the presidents are still alive and after their first inauguration they have lived 33 years, 21 years, 17 years, 9 years, and 1 year so far. We might use the values of 33+, 21+, 17+, 9+, and 1+, where the plus signs indicate that the actual value is equal to or greater than the current value. (These values were said to be censored at the time this list was compiled.) If you use the values in Data Set 12 and ignore the presidents who are still alive, what is the mean? If you use the values given

in Data Set 12 along with the additional values of 33+, 21+, 17+, 9+, and 1+, what do we know about the mean? Do the two results differ by much?