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\name{ex09.40}\alias{ex09.40}\title{data from exercise 9.40}\description{The \code{ex09.40} data frame has 16 rows and 2 columns.}\format{This data frame contains the following columns:\describe{\item{pipe}{a numeric vector}\item{brush}{a numeric vector}}}\details{}\source{Devore, J. L. (2000) \emph{Probability and Statistics for Engineering and the Sciences (5th ed)}, Duxbury}\examples{data(ex09.40)}\keyword{datasets}