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\name{ex16.09}\alias{ex16.09}\title{data from exercise 16.9}\description{The \code{ex16.09} data frame has 24 rows and 2 columns.}\format{This data frame contains the following columns:\describe{\item{xbar}{a numeric vector}\item{stderr}{a numeric vector}}}\details{}\source{Devore, J. L. (2000) \emph{Probability and Statistics for Engineering and the Sciences (5th ed)}, Duxbury}\examples{data(ex16.09)}\keyword{datasets}