The data come from an experiment to study the gain in weight of rats fed on
four different diets, distinguished by amount of protein (low and high) and
by source of pretein (beef and cereal).
Arguments
Format
A data frame with 40 observations on the following 4 variables.
ProteinSource
a factor with levels BeefCereal
ProteinAmount
a factor with levels HighLow
weightgain
weight gain in grams
Details
The design of the experiment is acompletely randomized with ten rats on each
of the four treatments.