\name{ex11.56}
\alias{ex11.56}
\docType{data}
\title{data from exercise 11.56}
\description{
The \code{ex11.56} data frame has 30 rows and 3 columns.
}
\format{
This data frame contains the following columns:
\describe{
\item{Rating}{
a numeric vector
}
\item{pH}{
a factor with levels
\code{pH 3} 
\code{pH 5.5} 
\code{pH 7} 
}
\item{Health}{
a factor with levels
\code{Diseased} 
\code{Healthy} 
}
}
}
%\details{}
\source{
  Devore, J. L. (2003) \emph{Probability and Statistics for Engineering and the Sciences (6th ed)}, Duxbury
}
\examples{
data(ex11.56)
}
\keyword{datasets}