Ant Counts on samples of different sandwiches
A data frame with 24 observations on the following 5 variables.
ButterButter on the sandwich?
FillingType of filling:
Ham \& Pickles,
Peanut Butter, or
BreadType of bread:
AntsNumber of ants on the sandwich
As young students, Dominic Kelly and his friends enjoyed watching ants
gather on pieces of sandwiches. Later, as a university student, Dominic
decided to study this with a more formal experiment. He chose three types of
sandwich fillings (vegemite, peanut butter, and ham \& pickles), four types
of bread (multigrain, rye, white, and wholemeal), and put butter on some of
To conduct the experiment he randomly chose a sandwich, broke off a piece, and left it on the ground near an ant hill. After several minutes he placed a jar over the sandwich bit and counteed the number of ants. He repeated the process, allowing time for ants to return to the hill after each trial, until he had two samples for each combination of the factors.
This dataset has only sandwiches with no butter. The data in SandwichAnts2 adds information for samples with butter.
Margaret Mackisack, “Favourite Experiments: An Addendum to What is the Use of Experiments Conducted by Statistics Students?", Journal of Statistics Education (1994) http://www.amstat.org/publications/jse/v2n1/mackisack.supp.html