A college library has five copies of a certain text on reserve. Two copies (1 and 2) are first printings, and the other three (3, 4, and 5) are second printings. A student examines these books in random order, stopping only when a second printing has been selected. One possible outcome is 5, and another is 213. a. ? ist the outcomes in . b. ?Let ?A ?denote the event that exactly one book must be examined. What outcomes are in A ? ?? c. ?Let ?B ?be the event that book 5 is the one selected. What outcomes are in ?B?? d. ?Let ?C ?be the event that book 1 is not examined. What outcomes are in ?C??

Answer: Step1: It's an enumerative study. It's actually easier to think of this problem by describing what it is not (i.e. which of the two options it is least like); here, we deduce that it's not an analytic study because an analytic study. Enumerative study: A statistical study is identifiable i.e, not ambiguous, and the elements of the population are well defined and unchanging under this study. Example of an Enumerative Study is a designed experiment. Analytic Study: Is not an Enumerative study, which draws conclusions about a process that does not even exit at the time of the study. Example of an Analytic Study is in the production industry, where the new product is developed as an improvement over the existing one.