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\title{Tipping data}
\format{A data frame with 244 rows and 7 variables}
One waiter recorded information about each tip he
received over a period of a few months working in one
restaurant. He collected several variables:
\itemize{ \item tip in dollars, \item bill in dollars,
\item sex of the bill payer, \item whether there were
smokers in the party, \item day of the week, \item time
of day, \item size of the party. }
In all he recorded 244 tips. The data was reported in a
collection of case studies for business statistics
(Bryant & Smith 1995).
Bryant, P. G. and Smith, M (1995) \emph{Practical Data
Analysis: Case Studies in Business Statistics}.
Homewood, IL: Richard D. Irwin Publishing:
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