Researcher,

I am having trouble understanding the following question. Please show
all work (even if it's repedetive)

An engineer is studying early morning traffic patterns at a particular
intersection. The observation period begins at 5:30 am. Let X denote
the time of arrival of the first vehicle from the north-south
direction; let Y denote the first arriveal from the east-west
direction. Tim eis measured in fractions of an hour after 5:30 am.
Assume that the density for (X, Y) is given by
fxy(x, y) = 1/x, 0 < y < x < 1

a. Find the curve of regression of X on Y. Is the regression linear?
b. Find the mean value of X when y = 0.5
c. Find the curve of regression of Y on X. Is the regression linear?
d. Find the mean of value Y when x = 0.75

A tip will be given if the work is done in Microsoft Word (with
special symbols, super/subscripts, etc. ... equation editor a plus!)
and done before midnight tonight.

Thanks.

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Clarification of Question by jgortner-ga on 04 Mar 2004 17:20 PST

I have done a bunch of work to help solve these questions. Please
refer to this document:

http://7ds.gotdns.org/dl/stat.doc

This should help you help me solve these questions.