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Dec 27, 2015 at 3:18 comment added Russ Lenth Draw a graph of the region where the density is nonzero and think about it.
Dec 27, 2015 at 2:43 comment added BCLC Well I guess physics examples are real life. Thanks rvl. Why is your example true?
Dec 27, 2015 at 0:55 comment added Russ Lenth The two random variables $X$ and $Y$ whose joint distribution is uniform on the doughnut. For a specific example, consider the joint density $f(x,y) = 1 / 3\pi$ when $1 < x^2+y^2 < 2$ and $0$ otherwise.
Dec 27, 2015 at 0:42 comment added BCLC What exactly are the two variables?
Dec 26, 2015 at 20:27 history answered Russ Lenth CC BY-SA 3.0