60 rats were fed varying diets to see which produced the greatest weight gain. Two diet factors were protein type: beef, pork, chicken and protein level: high and low.
A data frame with 60 observations on the following 3 variables, no NAs.
Weight gain (grams) of rats fed the diets.
Amount of protein in diet: 1 = High, 2 = Low.
Type of protein in diet: 1 = Beef, 2 = Pork, 3 = Cereal.
Fundamentals of Exploratory Analysis of Variance, Hoaglin D., Mosteller F. and Tukey J. eds., Wiley, 1991, p. 100; originally from Statistical Methods, 7th ed, Snedecor G. and Cochran W. (1980), Iowa State Press.
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