4 In an article about crime in the United States, Newsweek magazine (January 10, 1994) quoted FBI statistics stating that of all blacks slain in 1992, 94% were slain by blacks, and of all whites slain in 1992. 83% were slain by whites. Let Y denote race of victim and X denote race of murderer.

a) Which conditional distributions do these statistics refer to. those of Y at given levels of X, or those of X at given levels of I? Set up a table with race of murderer as rows and race of victim as columns, showing these conditional distributions.

b) Are X and Y independent or dependent? Explain.