Data posted at the FBI website (www.fbi.gov) indicated that of all blacks slain in 2013, 92% were

Question:

Data posted at the FBI website (www.fbi.gov) indicated that of all blacks slain in 2013, 92% were slain by blacks, and of all whites slain in 2013, 93% 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 y? Set up a contingency table showing these distributions.

(b) Are x and y independent or dependent? Explain.

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