The manager of a URL commercial address is interested in predicting the
number of megabytes downloaded, megasd, by clients according to the
number minutes they are connected, mconnected. The manager randomly
selects (megabyte, minute) pairs, and records the data.  The pairs
(megasd, mconnected) are stored in the data frame
URLaddress.
A data frame with 30 observations on the following 2 variables:
megabytes dowloaded
number of minutes connected
Ugarte, M. D., Militino, A. F., and Arnholt, A. T. (2008) Probability and Statistics with R. Chapman & Hall/CRC.
xyplot(mconnected ~ megasd, data = URLaddress, type=c("p", "r"))