iform distribution (in practice this could be done by first selecting a te of the point selected and Y = the y coordinate of the point selected. If below. cular region? [Hint: Draw a picture of the region of positive density D. en area.]

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An ecologist wishes to select a point inside a circular sampling region according to a uniform distribution (in practice this could be done by first selecting a
direction and then a distance from the center in that direction). Let X = the x coordinate of the point selected and Y = the y coordinate of the point selected. If
the circle is centered at (0, 0) and has radius R, then the joint pdf of X and Y is given below.
1
F(x, y) =
x2 + y2 s R2
otherwise
(a) What is the probability that the selected point is within of the center of the circular region? [Hint: Draw a picture of the region of positive density D.
Because f(x, y) is constant on D, computing a probability reduces to computing an area.]
(b) What is the probability that both X and Y differ from 0 by at most ?
R
(c) What is the probability that both X and Y differ from 0 by at most
(d) What is the marginal pdf of X?
fxx) =
What is the marginal pdf of Y?
fkv) =
Are X and Y independent?
Transcribed Image Text:An ecologist wishes to select a point inside a circular sampling region according to a uniform distribution (in practice this could be done by first selecting a direction and then a distance from the center in that direction). Let X = the x coordinate of the point selected and Y = the y coordinate of the point selected. If the circle is centered at (0, 0) and has radius R, then the joint pdf of X and Y is given below. 1 F(x, y) = x2 + y2 s R2 otherwise (a) What is the probability that the selected point is within of the center of the circular region? [Hint: Draw a picture of the region of positive density D. Because f(x, y) is constant on D, computing a probability reduces to computing an area.] (b) What is the probability that both X and Y differ from 0 by at most ? R (c) What is the probability that both X and Y differ from 0 by at most (d) What is the marginal pdf of X? fxx) = What is the marginal pdf of Y? fkv) = Are X and Y independent?
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