\name{ex11.09}
\alias{ex11.09}
\docType{data}
\title{data from exercise 11.9}
\description{
The \code{ex11.09} data frame has 36 rows and 3 columns.
}
\format{
This data frame contains the following columns:
\describe{
\item{effort}{
a numeric vector
}
\item{Type}{
a factor with levels
\code{T1} 
\code{T2} 
\code{T3} 
\code{T4} 
}
\item{Subject}{
a numeric vector
}
}
}
\details{
}
\source{
  Devore, J. L. (2003) \emph{Probability and Statistics for Engineering and the Sciences (6th ed)}, Duxbury
}
\examples{
data(ex11.09)
}
\keyword{datasets}